Setup project skeleton

21 files changed, 1360 insertions, 0 deletions

diff --git a/src/drv/ps1/cd/CMakeLists.txt b/src/drv/ps1/cd/CMakeLists.txt
new file mode 100644
index 0000000..9b84541
--- /dev/null
+++ b/src/drv/ps1/cd/CMakeLists.txt
@@ -0,0 +1,27 @@
+# wnix, a Unix-like operating system for WebAssembly applications.
+# Copyright (C) 2025  Xavier Del Campo Romero
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+add_library(drv_ps1_cd)
+add_subdirectory(src)
+target_include_directories(drv_ps1_cd PUBLIC include PRIVATE private_include)
+target_link_libraries(drv_ps1_cd
+    PUBLIC
+        c
+        drv_event
+    PRIVATE
+        drv_ps1_bios
+        drv_ps1_event
+)
diff --git a/src/drv/ps1/cd/include/drv/ps1/cd.h b/src/drv/ps1/cd/include/drv/ps1/cd.h
new file mode 100644
index 0000000..ff57622
--- /dev/null
+++ b/src/drv/ps1/cd/include/drv/ps1/cd.h
@@ -0,0 +1,28 @@
+/*
+ * wnix, a Unix-like operating system for WebAssembly applications.
+ * Copyright (C) 2025  Xavier Del Campo Romero
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef DRV_PS1_CD_H
+#define DRV_PS1_CD_H
+
+#include <drv/event.h>
+
+struct drv_ps1_cd *drv_ps1_cd_init(const struct drv_event *ev);
+int drv_ps1_cd_update(struct drv_ps1_cd *cd);
+void drv_ps1_cd_free(struct drv_ps1_cd *cd);
+
+#endif
diff --git a/src/drv/ps1/cd/private_include/drv/ps1/cd/regs.h b/src/drv/ps1/cd/private_include/drv/ps1/cd/regs.h
new file mode 100644
index 0000000..37b2d03
--- /dev/null
+++ b/src/drv/ps1/cd/private_include/drv/ps1/cd/regs.h
@@ -0,0 +1,66 @@
+/*
+ * wnix, a Unix-like operating system for WebAssembly applications.
+ * Copyright (C) 2025  Xavier Del Campo Romero
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef DRV_PS1_CD_REGS_H
+#define DRV_PS1_CD_REGS_H
+
+#include <stdint.h>
+
+struct cd_reg_status
+{
+    uint8_t index :2;
+    const uint8_t ADPBUSY :1, PRMEMPT :1, PRMWRDY :1, RSLRRDY :1, DRQSTS :1,
+        BUSYSTS :1;
+};
+
+struct cd_reg_cmd
+{
+    uint8_t cmd;
+};
+
+struct cd_reg_rsp
+{
+    uint8_t rsp;
+};
+
+struct cd_reg_param
+{
+    uint8_t param;
+};
+
+union cd_reg_if
+{
+    const struct
+    {
+        uint8_t response :3, :1, cmd_start :1, :3;
+    } r;
+
+    struct
+    {
+        uint8_t ack: 5, :1, CLRPRM :1, :1;
+    } w;
+};
+
+#define CD_REG(x) (0x1f801800 + (x))
+#define CD_REG_STATUS ((volatile struct cd_reg_status *)CD_REG(0))
+#define CD_REG_CMD ((volatile struct cd_reg_cmd *)CD_REG(1))
+#define CD_REG_RSP ((const volatile struct cd_reg_rsp *)CD_REG(1))
+#define CD_REG_PARAM ((volatile struct cd_reg_param *)CD_REG(2))
+#define CD_REG_IF ((volatile union cd_reg_if *)CD_REG(3))
+
+#endif
diff --git a/src/drv/ps1/cd/private_include/drv/ps1/cd/routines.h b/src/drv/ps1/cd/private_include/drv/ps1/cd/routines.h
new file mode 100644
index 0000000..0b756de
--- /dev/null
+++ b/src/drv/ps1/cd/private_include/drv/ps1/cd/routines.h
@@ -0,0 +1,37 @@
+/*
+ * wnix, a Unix-like operating system for WebAssembly applications.
+ * Copyright (C) 2025  Xavier Del Campo Romero
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef DRV_PS1_CD_ROUTINES_H
+#define DRV_PS1_CD_ROUTINES_H
+
+#include <drv/event.h>
+#include <drv/ps1/cd/types.h>
+#include <drv/ps1/bios.h>
+#include <sys/types.h>
+#include <stddef.h>
+
+int drv_ps1_cd_send(const struct cmd *cmd);
+int drv_ps1_cd_getstat(void);
+int drv_ps1_cd_read(void *buf, size_t n, off_t offset,
+    const struct drv_event_done *done, void *args);
+int drv_ps1_cd_write(const void *buf, size_t n,
+    const struct drv_event_done *done, void *args);
+int drv_ps1_cd_next(void);
+struct CdAsyncSeekL drv_ps1_cd_toseekl(unsigned i);
+
+#endif
diff --git a/src/drv/ps1/cd/private_include/drv/ps1/cd/types.h b/src/drv/ps1/cd/private_include/drv/ps1/cd/types.h
new file mode 100644
index 0000000..2d4ae51
--- /dev/null
+++ b/src/drv/ps1/cd/private_include/drv/ps1/cd/types.h
@@ -0,0 +1,111 @@
+/*
+ * wnix, a Unix-like operating system for WebAssembly applications.
+ * Copyright (C) 2025  Xavier Del Campo Romero
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef DRV_PS1_CD_TYPES_H
+#define DRV_PS1_CD_TYPES_H
+
+#include <drv/event.h>
+#include <sys/types.h>
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+
+struct drv_ps1_cd
+{
+    bool available;
+    struct drv_event ev;
+};
+
+struct cmd
+{
+    enum
+    {
+        CMD_SYNC,
+        CMD_GETSTAT,
+        CMD_SETLOC,
+    } cmd;
+
+    union cmd_param
+    {
+        struct cmd_setloc
+        {
+            uint8_t min, sec, sect;
+        } setloc;
+    } params;
+};
+
+struct cd_prv_getstat
+{
+    union
+    {
+        struct
+        {
+            uint8_t invalid :1, motor :1, seek_error :1, id_error :1,
+                shell_open :1, reading :1, seeking :1, playing_cdda :1;
+        } bits;
+
+        uint8_t byte;
+    } status;
+};
+
+struct cd_prv_read
+{
+    int endevent, errevent;
+};
+
+struct cd_req_read
+{
+    void *buf;
+    size_t n;
+    off_t offset;
+};
+
+struct cd_req
+{
+    union
+    {
+        struct cd_req_read read;
+    } u;
+
+    int (*f)(void);
+    struct drv_event_done done;
+    struct cd_req *next;
+};
+
+enum {CD_SECTOR_SZ = 2048};
+
+struct cd_prv
+{
+    bool available, sector_read;
+    int (*next)(void);
+    int event;
+    struct cmd cmd;
+    struct cd_req *head, *tail;
+    char sector[CD_SECTOR_SZ];
+    off_t offset;
+
+    union
+    {
+        struct cd_prv_getstat getstat;
+        struct cd_prv_read read;
+    } u;
+};
+
+extern struct cd_prv drv_ps1_cd_prv;
+
+#endif
diff --git a/src/drv/ps1/cd/private_include/drv/ps1/cd/virt/types.h b/src/drv/ps1/cd/private_include/drv/ps1/cd/virt/types.h
new file mode 100644
index 0000000..59437c0
--- /dev/null
+++ b/src/drv/ps1/cd/private_include/drv/ps1/cd/virt/types.h
@@ -0,0 +1,36 @@
+/*
+ * wnix, a Unix-like operating system for WebAssembly applications.
+ * Copyright (C) 2025  Xavier Del Campo Romero
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef DRV_PS1_CD_VIRT_TYPES_H
+#define DRV_PS1_CD_VIRT_TYPES_H
+
+#include <drv/event.h>
+
+struct drv_ps1_cd
+{
+    struct drv_event ev;
+};
+
+struct cd_prv
+{
+    int (*next)(void);
+};
+
+extern struct cd_prv drv_ps1_cd_prv;
+
+#endif
diff --git a/src/drv/ps1/cd/src/CMakeLists.txt b/src/drv/ps1/cd/src/CMakeLists.txt
new file mode 100644
index 0000000..df5ecca
--- /dev/null
+++ b/src/drv/ps1/cd/src/CMakeLists.txt
@@ -0,0 +1,33 @@
+# wnix, a Unix-like operating system for WebAssembly applications.
+# Copyright (C) 2025  Xavier Del Campo Romero
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+if(WNIX_VIRT_CD)
+    add_subdirectory(virt)
+else()
+    target_sources(drv_ps1_cd PRIVATE
+        free.c
+        getstat.c
+        init.c
+        next.c
+        prv.c
+        read.c
+        toseekl.c
+        update.c
+        write.c
+    )
+endif()
+
+target_link_libraries(drv_ps1_cd PRIVATE kprintf)
diff --git a/src/drv/ps1/cd/src/ensure_event.c b/src/drv/ps1/cd/src/ensure_event.c
new file mode 100644
index 0000000..592184a
--- /dev/null
+++ b/src/drv/ps1/cd/src/ensure_event.c
@@ -0,0 +1,37 @@
+/*
+ * wnix, a Unix-like operating system for WebAssembly applications.
+ * Copyright (C) 2025  Xavier Del Campo Romero
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <drv/ps1/bios.h>
+#include <drv/ps1/cd/types.h>
+#include <drv/ps1/event.h>
+#include <stddef.h>
+
+int drv_ps1_cd_ensure_event(struct cd_prv *const p)
+{
+    if (p->event)
+        return 0;
+
+    const int event = drv_ps1_event_open(CLASS_CDROM, SPEC_COMMAND_COMPLETE,
+        MODE_READY, NULL);
+
+    if (event == -1)
+        return -1;
+
+    drv_ps1_event_enable(p->event = event);
+    return 0;
+}
diff --git a/src/drv/ps1/cd/src/free.c b/src/drv/ps1/cd/src/free.c
new file mode 100644
index 0000000..ed6f347
--- /dev/null
+++ b/src/drv/ps1/cd/src/free.c
@@ -0,0 +1,23 @@
+/*
+ * wnix, a Unix-like operating system for WebAssembly applications.
+ * Copyright (C) 2025  Xavier Del Campo Romero
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <drv/ps1/cd.h>
+
+void drv_ps1_cd_free(struct drv_ps1_cd *const cd)
+{
+}
diff --git a/src/drv/ps1/cd/src/getstat.c b/src/drv/ps1/cd/src/getstat.c
new file mode 100644
index 0000000..34bdaf5
--- /dev/null
+++ b/src/drv/ps1/cd/src/getstat.c
@@ -0,0 +1,70 @@
+/*
+ * wnix, a Unix-like operating system for WebAssembly applications.
+ * Copyright (C) 2025  Xavier Del Campo Romero
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <drv/ps1/cd/routines.h>
+#include <drv/ps1/bios.h>
+#include <drv/ps1/event.h>
+#include <kprintf.h>
+
+static int wait_event(void)
+{
+    struct cd_prv *const p = &drv_ps1_cd_prv;
+    struct cd_prv_getstat *const g = &p->u.getstat;
+
+    if (drv_ps1_event_test(p->event))
+    {
+        p->available = !g->status.bits.shell_open;
+
+        if (!p->head)
+            return drv_ps1_cd_getstat();
+
+        return p->head->f();
+    }
+
+    return 0;
+}
+
+static int ensure_event(struct cd_prv *const p)
+{
+    if (p->event)
+        return 0;
+    else if ((p->event = drv_ps1_event_open(CLASS_CDROM, SPEC_COMMAND_COMPLETE,
+        MODE_READY, NULL)) == -1)
+        return -1;
+
+    drv_ps1_event_enable(p->event);
+    return 0;
+}
+
+int drv_ps1_cd_getstat(void)
+{
+    struct cd_prv *const p = &drv_ps1_cd_prv;
+    struct cd_prv_getstat *const g = &p->u.getstat;
+
+    /* TODO: CdAsyncGetStatus is *very* slow (~2.5 seconds / 10k calls) */
+    if (ensure_event(p))
+        return -1;
+    else if (!CdAsyncGetStatus(&g->status.byte))
+    {
+        kprintf("%s: CdAsyncGetStatus failed\n", __func__);
+        return -1;
+    }
+
+    p->next = wait_event;
+    return 0;
+}
diff --git a/src/drv/ps1/cd/src/init.c b/src/drv/ps1/cd/src/init.c
new file mode 100644
index 0000000..b452e82
--- /dev/null
+++ b/src/drv/ps1/cd/src/init.c
@@ -0,0 +1,42 @@
+/*
+ * wnix, a Unix-like operating system for WebAssembly applications.
+ * Copyright (C) 2025  Xavier Del Campo Romero
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <drv/ps1/cd.h>
+#include <drv/ps1/cd/routines.h>
+#include <drv/ps1/cd/types.h>
+#include <drv/event.h>
+#include <stddef.h>
+#include <stdlib.h>
+
+struct drv_ps1_cd *drv_ps1_cd_init(const struct drv_event *const ev)
+{
+    struct drv_ps1_cd *const ret = malloc(sizeof *ret);
+    struct cd_prv *const p = &drv_ps1_cd_prv;
+
+    if (!ret)
+        return NULL;
+    else if (!p->next && drv_ps1_cd_getstat())
+        goto failure;
+
+    *ret = (const struct drv_ps1_cd){.ev = *ev};
+    return ret;
+
+failure:
+    free(ret);
+    return NULL;
+}
diff --git a/src/drv/ps1/cd/src/next.c b/src/drv/ps1/cd/src/next.c
new file mode 100644
index 0000000..b26633a
--- /dev/null
+++ b/src/drv/ps1/cd/src/next.c
@@ -0,0 +1,37 @@
+/*
+ * wnix, a Unix-like operating system for WebAssembly applications.
+ * Copyright (C) 2025  Xavier Del Campo Romero
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <drv/ps1/cd.h>
+#include <drv/ps1/cd/routines.h>
+#include <drv/ps1/cd/types.h>
+#include <stdlib.h>
+
+int drv_ps1_cd_next(void)
+{
+    struct cd_prv *const p = &drv_ps1_cd_prv;
+    struct cd_req *const next = p->head->next;
+
+    free(p->head);
+
+    if (next && next->f())
+        return -1;
+    else if (!(p->head = next))
+        return drv_ps1_cd_getstat();
+
+    return 0;
+}
diff --git a/src/drv/ps1/cd/src/prv.c b/src/drv/ps1/cd/src/prv.c
new file mode 100644
index 0000000..61ed4b4
--- /dev/null
+++ b/src/drv/ps1/cd/src/prv.c
@@ -0,0 +1,22 @@
+/*
+ * wnix, a Unix-like operating system for WebAssembly applications.
+ * Copyright (C) 2025  Xavier Del Campo Romero
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <drv/ps1/cd.h>
+#include <drv/ps1/cd/types.h>
+
+struct cd_prv drv_ps1_cd_prv;
diff --git a/src/drv/ps1/cd/src/read.c b/src/drv/ps1/cd/src/read.c
new file mode 100644
index 0000000..d21cbae
--- /dev/null
+++ b/src/drv/ps1/cd/src/read.c
@@ -0,0 +1,239 @@
+/*
+ * wnix, a Unix-like operating system for WebAssembly applications.
+ * Copyright (C) 2025  Xavier Del Campo Romero
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <drv/ps1/cd.h>
+#include <drv/ps1/cd/routines.h>
+#include <drv/ps1/cd/types.h>
+#include <drv/ps1/event.h>
+#include <drv/event.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+
+static int seek(void);
+
+static int deliver_event(struct cd_prv *const p, const int error)
+{
+    const struct cd_prv_read *const read = &p->u.read;
+    const struct cd_req *const req = p->head;
+    const struct drv_event_done *const d = &req->done;
+
+    drv_ps1_event_disable(read->endevent);
+    drv_ps1_event_close(read->endevent);
+    drv_ps1_event_disable(read->errevent);
+    drv_ps1_event_close(read->errevent);
+
+    if (!error)
+    {
+        const struct cd_req_read *const rr = &req->u.read;
+        const long offset = rr->offset % CD_SECTOR_SZ;
+
+        memcpy(rr->buf, p->sector + offset, rr->n);
+
+        if (!((p->offset += rr->n) % CD_SECTOR_SZ))
+            p->sector_read = false;
+    }
+
+    if (d->f(error, d->args) || drv_ps1_cd_next())
+        return -1;
+
+    return 0;
+}
+
+static int wait_read(void)
+{
+    struct cd_prv *const p = &drv_ps1_cd_prv;
+    const struct cd_prv_read *const read = &p->u.read;
+
+    if (drv_ps1_event_test(p->event))
+    {
+        p->sector_read = true;
+        return deliver_event(p, SUCCESS);
+    }
+    else if (drv_ps1_event_test(read->errevent)
+        || drv_ps1_event_test(read->endevent))
+        return deliver_event(p, EIO);
+
+    return 0;
+}
+
+static int uncached_read(struct cd_prv *const p)
+{
+    int endevent, errevent;
+    struct cd_prv_read *const r = &p->u.read;
+    const struct CdAsyncReadSector_mode mode =
+    {
+        .mode.bits.speed = 1,
+    };
+
+    endevent = drv_ps1_event_open(CLASS_CDROM, SPEC_DATA_END, MODE_READY, NULL);
+    errevent = drv_ps1_event_open(CLASS_CDROM, SPEC_ERROR, MODE_READY, NULL);
+
+    if (endevent == -1 || errevent == -1)
+        goto failure;
+
+    *r = (const struct cd_prv_read)
+    {
+        .endevent = endevent,
+        .errevent = errevent
+    };
+
+    drv_ps1_event_enable(endevent);
+    drv_ps1_event_enable(errevent);
+
+    if (!CdAsyncReadSector(1, p->sector, mode))
+        goto failure;
+
+    p->next = wait_read;
+    return 0;
+
+failure:
+
+    if (endevent != -1)
+    {
+        drv_ps1_event_disable(endevent);
+        drv_ps1_event_close(endevent);
+    }
+
+    if (errevent != -1)
+    {
+        drv_ps1_event_disable(errevent);
+        drv_ps1_event_close(errevent);
+    }
+
+    return -1;
+}
+
+static int cached_read(struct cd_prv *const p)
+{
+    struct cd_req *const req = p->head;
+    struct cd_req_read *const rr = &req->u.read;
+    const struct drv_event_done *const done = &req->done;
+    const off_t offset = rr->offset % CD_SECTOR_SZ,
+        rem = CD_SECTOR_SZ - offset,
+        n = rr->n > rem ? rem : rr->n;
+
+    memcpy(rr->buf, p->sector + offset, n);
+
+    if (!((p->offset += n) % CD_SECTOR_SZ))
+        p->sector_read = false;
+
+    if (done->f(SUCCESS, done->args) || drv_ps1_cd_next())
+        return -1;
+
+    return 0;
+}
+
+static int wait_seek(void)
+{
+    struct cd_prv *const p = &drv_ps1_cd_prv;
+    const struct cd_req *const req = p->head;
+    const struct cd_req_read *const rr = &req->u.read;
+    const struct cd_prv_read *const r = &p->u.read;
+
+    if (drv_ps1_event_test(p->event))
+    {
+        drv_ps1_event_disable(r->errevent);
+        drv_ps1_event_close(r->errevent);
+        p->offset = rr->offset;
+        return uncached_read(p);
+    }
+    else if (drv_ps1_event_test(r->errevent))
+        return deliver_event(p, EIO);
+
+    return 0;
+}
+
+static int seek(void)
+{
+    struct cd_prv *const p = &drv_ps1_cd_prv;
+    struct cd_prv_read *const r = &p->u.read;
+    const struct cd_req_read *rr = &p->head->u.read;
+    const unsigned sector = rr->offset / CD_SECTOR_SZ;
+    const struct CdAsyncSeekL seekl = drv_ps1_cd_toseekl(sector);
+    const int errevent = drv_ps1_event_open(CLASS_CDROM, SPEC_ERROR,
+        MODE_READY, NULL);
+
+    if (errevent == -1)
+        goto failure;
+
+    *r = (const struct cd_prv_read){.errevent = errevent};
+    p->sector_read = false;
+    drv_ps1_event_enable(errevent);
+
+    if (!CdAsyncSeekL(&seekl))
+        goto failure;
+
+    p->next = wait_seek;
+    return 0;
+
+failure:
+
+    if (errevent != -1)
+    {
+        drv_ps1_event_disable(errevent);
+        drv_ps1_event_close(errevent);
+    }
+
+    return -1;
+}
+
+static int start(void)
+{
+    struct cd_prv *const p = &drv_ps1_cd_prv;
+    const struct cd_req *const req = p->head;
+    const struct cd_req_read *const rr = &req->u.read;
+    const off_t cursect = p->offset / CD_SECTOR_SZ,
+        tgtsect = rr->offset / CD_SECTOR_SZ;
+
+    if (cursect != tgtsect || !p->sector_read)
+        return seek();
+
+    /* TODO: multi-sector reads, make sure cache can really be used */
+    return cached_read(p);
+}
+
+int drv_ps1_cd_read(void *const buf, const size_t n, const off_t offset,
+    const struct drv_event_done *const done, void *const args)
+{
+    struct cd_prv *const p = &drv_ps1_cd_prv;
+    struct cd_req *const r = malloc(sizeof *r);
+
+    if (!r)
+        return -1;
+
+    *r = (const struct cd_req)
+    {
+        .f = start,
+        .done = *done,
+        .u.read =
+        {
+            .offset = offset,
+            .buf = buf,
+            .n = n
+        }
+    };
+
+    if (!p->head)
+        p->head = r;
+    else
+        p->tail->next = r;
+
+    p->tail = r;
+    return 0;
+}
diff --git a/src/drv/ps1/cd/src/readdebug b/src/drv/ps1/cd/src/readdebug
new file mode 100644
index 0000000..b2c09a7
--- /dev/null
+++ b/src/drv/ps1/cd/src/readdebug
@@ -0,0 +1,253 @@
+/*
+ * wnix, a Unix-like operating system for WebAssembly applications.
+ * Copyright (C) 2025  Xavier Del Campo Romero
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <drv/ps1/cd.h>
+#include <drv/ps1/cd/routines.h>
+#include <drv/ps1/cd/types.h>
+#include <drv/ps1/event.h>
+#include <drv/event.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+
+
+#include <drv/ps1/bios.h>
+
+static int seek(void);
+
+static int deliver_event(struct cd_prv *const p, const int error)
+{
+    const struct cd_prv_read *const read = &p->u.read;
+    const struct cd_req *const req = p->head;
+    const struct drv_event_done *const d = &req->done;
+
+    drv_ps1_event_disable(read->endevent);
+    drv_ps1_event_close(read->endevent);
+    drv_ps1_event_disable(read->errevent);
+    drv_ps1_event_close(read->errevent);
+
+    if (!error)
+    {
+        const struct cd_req_read *const rr = &req->u.read;
+        const long offset = rr->offset % CD_SECTOR_SZ;
+
+        memcpy(rr->buf, p->sector + offset, rr->n);
+
+        if (!((p->offset += rr->n) % CD_SECTOR_SZ))
+            p->sector_read = false;
+    }
+
+    if (d->f(error, d->args) || drv_ps1_cd_next())
+        return -1;
+
+    return 0;
+}
+
+static int wait_read(void)
+{
+    struct cd_prv *const p = &drv_ps1_cd_prv;
+    const struct cd_prv_read *const read = &p->u.read;
+
+    if (drv_ps1_event_test(p->event))
+    {
+        p->sector_read = true;
+        return deliver_event(p, SUCCESS);
+    }
+    else if (drv_ps1_event_test(read->errevent)
+        || drv_ps1_event_test(read->endevent))
+        return deliver_event(p, EIO);
+
+    return 0;
+}
+
+static int uncached_read(struct cd_prv *const p)
+{
+    int endevent, errevent;
+    struct cd_prv_read *const r = &p->u.read;
+    const struct CdAsyncReadSector_mode mode =
+    {
+        .mode.bits.speed = 1,
+    };
+
+    endevent = drv_ps1_event_open(CLASS_CDROM, SPEC_DATA_END, MODE_READY, NULL);
+    errevent = drv_ps1_event_open(CLASS_CDROM, SPEC_ERROR, MODE_READY, NULL);
+
+    if (endevent == -1 || errevent == -1)
+        goto failure;
+
+    *r = (const struct cd_prv_read)
+    {
+        .endevent = endevent,
+        .errevent = errevent
+    };
+
+    drv_ps1_event_enable(endevent);
+    drv_ps1_event_enable(errevent);
+
+    Printf("preparing async read\n");
+    if (!CdAsyncReadSector(1, p->sector, mode))
+        goto failure;
+
+    p->next = wait_read;
+    return 0;
+
+failure:
+
+    if (endevent != -1)
+    {
+        drv_ps1_event_disable(endevent);
+        drv_ps1_event_close(endevent);
+    }
+
+    if (errevent != -1)
+    {
+        drv_ps1_event_disable(errevent);
+        drv_ps1_event_close(errevent);
+    }
+
+    return -1;
+}
+
+static int cached_read(struct cd_prv *const p)
+{
+    struct cd_req *const req = p->head;
+    struct cd_req_read *const rr = &req->u.read;
+    const struct drv_event_done *const done = &req->done;
+    const off_t offset = rr->offset % CD_SECTOR_SZ,
+        rem = CD_SECTOR_SZ - offset,
+        n = rr->n > rem ? rem : rr->n;
+
+    Printf("Doing %lu-byte cached read from offset %lu to %p\n",
+            (unsigned long) n, (unsigned long) offset, (void *)rr->buf);
+    memcpy(rr->buf, p->sector + offset, n);
+
+    if (!((p->offset += n) % CD_SECTOR_SZ))
+        p->sector_read = false;
+
+    if (done->f(SUCCESS, done->args) || drv_ps1_cd_next())
+        return -1;
+
+    return 0;
+}
+
+static int wait_seek(void)
+{
+    struct cd_prv *const p = &drv_ps1_cd_prv;
+    const struct cd_req *const req = p->head;
+    const struct cd_req_read *const rr = &req->u.read;
+    const struct cd_prv_read *const r = &p->u.read;
+
+    if (drv_ps1_event_test(p->event))
+    {
+        Printf("finished seeking\n");
+        drv_ps1_event_disable(r->errevent);
+        drv_ps1_event_close(r->errevent);
+        p->offset = rr->offset;
+        return uncached_read(p);
+    }
+    else if (drv_ps1_event_test(r->errevent))
+    {
+        Printf("failed to seek\n");
+        return deliver_event(p, EIO);
+    }
+
+    return 0;
+}
+
+static int seek(void)
+{
+    struct cd_prv *const p = &drv_ps1_cd_prv;
+    struct cd_prv_read *const r = &p->u.read;
+    const struct cd_req_read *rr = &p->head->u.read;
+    const unsigned sector = rr->offset / CD_SECTOR_SZ;
+    const struct CdAsyncSeekL seekl = drv_ps1_cd_toseekl(sector);
+    const int errevent = drv_ps1_event_open(CLASS_CDROM, SPEC_ERROR,
+        MODE_READY, NULL);
+
+    if (errevent == -1)
+        goto failure;
+
+    *r = (const struct cd_prv_read){.errevent = errevent};
+    p->sector_read = false;
+    drv_ps1_event_enable(errevent);
+
+    Printf("Seeking to offset %lu\n", (unsigned long)rr->offset);
+
+    if (!CdAsyncSeekL(&seekl))
+        goto failure;
+
+    p->next = wait_seek;
+    return 0;
+
+failure:
+
+    if (errevent != -1)
+    {
+        drv_ps1_event_disable(errevent);
+        drv_ps1_event_close(errevent);
+    }
+
+    return -1;
+}
+
+static int start(void)
+{
+    struct cd_prv *const p = &drv_ps1_cd_prv;
+    const struct cd_req *const req = p->head;
+    const struct cd_req_read *const rr = &req->u.read;
+    const off_t cursect = p->offset / CD_SECTOR_SZ,
+        tgtsect = rr->offset / CD_SECTOR_SZ;
+
+    if (cursect != tgtsect || !p->sector_read)
+        return seek();
+
+    /* TODO: multi-sector reads, make sure cache can really be used */
+    return cached_read(p);
+}
+
+int drv_ps1_cd_read(void *const buf, const size_t n, const off_t offset,
+    const struct drv_event_done *const done, void *const args)
+{
+    struct cd_prv *const p = &drv_ps1_cd_prv;
+    struct cd_req *const r = malloc(sizeof *r);
+
+    if (!r)
+        return -1;
+
+    *r = (const struct cd_req)
+    {
+        .f = start,
+        .done = *done,
+        .u.read =
+        {
+            .offset = offset,
+            .buf = buf,
+            .n = n
+        }
+    };
+
+    if (!p->head)
+        p->head = r;
+    else
+        p->tail->next = r;
+
+    p->tail = r;
+    Printf("Added %p {.buf=%p, .n=%lu} to read reqs\n", (void *)p->tail, buf,
+        (unsigned long)n);
+    return 0;
+}
diff --git a/src/drv/ps1/cd/src/send.c b/src/drv/ps1/cd/src/send.c
new file mode 100644
index 0000000..01aa5cb
--- /dev/null
+++ b/src/drv/ps1/cd/src/send.c
@@ -0,0 +1,101 @@
+/*
+ * wnix, a Unix-like operating system for WebAssembly applications.
+ * Copyright (C) 2025  Xavier Del Campo Romero
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <drv/ps1/cd.h>
+#include <drv/ps1/bios.h>
+#include <drv/ps1/cd/regs.h>
+#include <drv/ps1/cd/routines.h>
+#include <drv/ps1/cd/types.h>
+#include <drv/ps1/event.h>
+#include <stdint.h>
+
+static int wait_event(void)
+{
+    struct cd_prv *const p = &drv_ps1_cd_prv;
+
+    if (drv_ps1_event_test(p->event))
+    {
+        const union cd_prv_getstat g = {.status = CD_REG_RSP->rsp};
+
+        p->available = !g.bits.shell_open;
+    }
+
+    return 0;
+}
+
+static void send_params(const struct cd_prv *const p)
+{
+    static const size_t n[] =
+    {
+        [CMD_SETLOC] = sizeof (struct cmd_setloc)
+    };
+
+    const uint8_t cmd = p->cmd.cmd, index = CD_REG_STATUS->index;
+
+    if (cmd < sizeof n / sizeof *n)
+    {
+        const void *const vbuf = &p->cmd.params;
+        const uint8_t *buf = vbuf;
+
+        CD_REG_STATUS->index = 0;
+
+        for (size_t i = 0; i < n[cmd]; i++)
+            CD_REG_PARAM->param = *buf++;
+
+        CD_REG_STATUS->index = index;
+    }
+}
+
+static int send_data(void)
+{
+    struct cd_prv *const p = &drv_ps1_cd_prv;
+
+    if (CD_REG_STATUS->BUSYSTS)
+        return 0;
+
+    send_params(p);
+    CD_REG_CMD->cmd = p->cmd.cmd;
+    p->next = wait_event;
+    return 0;
+}
+
+static int reset_param_fifo(void)
+{
+    struct cd_prv *const p = &drv_ps1_cd_prv;
+
+    if (CD_REG_STATUS->BUSYSTS)
+        return 0;
+
+    CD_REG_IF->w.ack = 0x1f;
+    CD_REG_STATUS->index = 1;
+    CD_REG_IF->w.CLRPRM = 1;
+    p->next = send_data;
+    return 0;
+}
+
+int drv_ps1_cd_send(const struct cmd *const cmd)
+{
+    struct cd_prv *const p = &drv_ps1_cd_prv;
+
+    if (drv_ps1_cd_ensure_event(p))
+        return -1;
+
+    p->cmd = *cmd;
+    p->next = reset_param_fifo;
+    return 0;
+}
diff --git a/src/drv/ps1/cd/src/toseekl.c b/src/drv/ps1/cd/src/toseekl.c
new file mode 100644
index 0000000..ee776c9
--- /dev/null
+++ b/src/drv/ps1/cd/src/toseekl.c
@@ -0,0 +1,54 @@
+/* Original functions from psn00bsdk, commit 5d9aa2d3
+ *
+ * itob extracted from libpsn00b/include/psxcd.h
+ * CdIntToPos (here renamed to drv_ps1_cd_toseekl) extracted from
+ * libpsn00b/psxcd/misc.c
+ *
+ * Original copyright notice:
+ *
+ * PSn00bSDK CD-ROM library
+ * (C) 2020-2023 Lameguy64, spicyjpeg - MPL licensed
+ */
+
+/*
+ * wnix, a Unix-like operating system for WebAssembly applications.
+ * Copyright (C) 2025  Xavier Del Campo Romero
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <drv/ps1/cd/routines.h>
+#include <drv/ps1/bios.h>
+
+/**
+ * @brief Translates a decimal value to BCD.
+ *
+ * @details Translates a decimal integer in 0-99 range into a BCD format value.
+ */
+static unsigned itob(const unsigned i)
+{
+    return ((i / 10) * 16) | (i % 10);
+}
+
+struct CdAsyncSeekL drv_ps1_cd_toseekl(unsigned i)
+{
+	i += 150;
+
+    return (const struct CdAsyncSeekL)
+    {
+        .minutes = itob(i / (75 * 60)),
+        .seconds = itob((i / 75) % 60),
+        .frames = itob(i % 75)
+    };
+}
diff --git a/src/drv/ps1/cd/src/update.c b/src/drv/ps1/cd/src/update.c
new file mode 100644
index 0000000..148dd87
--- /dev/null
+++ b/src/drv/ps1/cd/src/update.c
@@ -0,0 +1,47 @@
+/*
+ * wnix, a Unix-like operating system for WebAssembly applications.
+ * Copyright (C) 2025  Xavier Del Campo Romero
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <drv/ps1/cd.h>
+#include <drv/ps1/cd/types.h>
+#include <drv/ps1/cd/routines.h>
+#include <drv/event.h>
+#include <stdbool.h>
+
+int drv_ps1_cd_update(struct drv_ps1_cd *const cd)
+{
+    struct cd_prv *const p = &drv_ps1_cd_prv;
+
+    if (p->next())
+        return -1;
+    else if (p->available ^ cd->available)
+    {
+        const struct drv_event *const ev = &cd->ev;
+        static const struct drv_event_ops ops =
+        {
+            .read = drv_ps1_cd_read,
+            .write = drv_ps1_cd_write
+        };
+
+        if (ev->status("cd0", &ops, p->available, 0440, ev->args))
+            return -1;
+
+        cd->available = p->available;
+    }
+
+    return 0;
+}
diff --git a/src/drv/ps1/cd/src/virt/CMakeLists.txt b/src/drv/ps1/cd/src/virt/CMakeLists.txt
new file mode 100644
index 0000000..0e5bd1b
--- /dev/null
+++ b/src/drv/ps1/cd/src/virt/CMakeLists.txt
@@ -0,0 +1,25 @@
+# wnix, a Unix-like operating system for WebAssembly applications.
+# Copyright (C) 2025  Xavier Del Campo Romero
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+target_sources(drv_ps1_cd PRIVATE
+    # free.c
+    init.c
+    # next.c
+    # prv.c
+    # read.c
+    # update.c
+    # write.c
+)
diff --git a/src/drv/ps1/cd/src/virt/init.c b/src/drv/ps1/cd/src/virt/init.c
new file mode 100644
index 0000000..204f7fa
--- /dev/null
+++ b/src/drv/ps1/cd/src/virt/init.c
@@ -0,0 +1,41 @@
+/*
+ * wnix, a Unix-like operating system for WebAssembly applications.
+ * Copyright (C) 2025  Xavier Del Campo Romero
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <drv/ps1/cd.h>
+#include <drv/ps1/cd/virt/types.h>
+#include <drv/event.h>
+#include <stddef.h>
+#include <stdlib.h>
+
+struct drv_ps1_cd *drv_ps1_cd_init(const struct drv_event *const ev)
+{
+    struct drv_ps1_cd *const ret = malloc(sizeof *ret);
+    struct cd_prv *const p = &drv_ps1_cd_prv;
+
+    if (!ret)
+        return NULL;
+    else if (!p->next && drv_ps1_cd_getstat())
+        goto failure;
+
+    *ret = (const struct drv_ps1_cd){.ev = *ev};
+    return ret;
+
+failure:
+    free(ret);
+    return NULL;
+}
diff --git a/src/drv/ps1/cd/src/write.c b/src/drv/ps1/cd/src/write.c
new file mode 100644
index 0000000..ba47993
--- /dev/null
+++ b/src/drv/ps1/cd/src/write.c
@@ -0,0 +1,31 @@
+/*
+ * wnix, a Unix-like operating system for WebAssembly applications.
+ * Copyright (C) 2025  Xavier Del Campo Romero
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <drv/ps1/cd.h>
+#include <drv/ps1/cd/routines.h>
+#include <drv/ps1/cd/types.h>
+#include <drv/event.h>
+#include <errno.h>
+
+int drv_ps1_cd_write(const void *const buf, const size_t n,
+    const struct drv_event_done *const done, void *const args)
+{
+    /* TODO: write event callback returning EROFS */
+    errno = EROFS;
+    return -1;
+}