Setup project skeleton

9 files changed, 286 insertions, 0 deletions

diff --git a/src/drv/ps1/irq/CMakeLists.txt b/src/drv/ps1/irq/CMakeLists.txt
new file mode 100644
index 0000000..8327cd5
--- /dev/null
+++ b/src/drv/ps1/irq/CMakeLists.txt
@@ -0,0 +1,20 @@
+# 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_irq)
+add_subdirectory(src)
+target_include_directories(drv_ps1_irq PUBLIC include PRIVATE private_include)
+target_link_libraries(drv_ps1_irq PUBLIC c PRIVATE drv_ps1_bios)
diff --git a/src/drv/ps1/irq/include/drv/ps1/irq.h b/src/drv/ps1/irq/include/drv/ps1/irq.h
new file mode 100644
index 0000000..0d40c7f
--- /dev/null
+++ b/src/drv/ps1/irq/include/drv/ps1/irq.h
@@ -0,0 +1,64 @@
+/*
+ * 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_IRQ_H
+#define DRV_PS1_IRQ_H
+
+#include <stdint.h>
+
+union drv_ps1_statmask
+{
+    struct
+    {
+        uint32_t vblank :1, gpu :1, cdrom :1, dma :1, tmr0 :1, tmr1 :1, tmr2 :1,
+            controller :1, sio :1, spu :1, lightpen :1, :21;
+    } bits;
+
+    uint32_t mask;
+};
+
+#define I_BASE(x) (0x1f801070 + (x))
+#define I_STAT ((volatile union drv_ps1_statmask *)I_BASE(0))
+#define I_MASK ((volatile union drv_ps1_statmask *)I_BASE(4))
+
+enum drv_ps1_irq
+{
+    IRQ_VBLANK,
+    IRQ_GPU,
+    IRQ_CDROM,
+    IRQ_DMA,
+    IRQ_TMR0,
+    IRQ_TMR1,
+    IRQ_TMR2,
+    IRQ_JOYPAD_MEMCARD,
+    IRQ_SIO,
+    IRQ_SPU,
+    IRQ_JOYPAD_IO
+};
+
+struct drv_ps1_irq_src
+{
+    int mask;
+    int (*fn)(void);
+    struct drv_ps1_irq_src *next;
+};
+
+int drv_ps1_irq_init(void);
+int drv_ps1_irq_set(struct drv_ps1_irq_src *src);
+
+#endif
diff --git a/src/drv/ps1/irq/private_include/drv/ps1/irq/routines.h b/src/drv/ps1/irq/private_include/drv/ps1/irq/routines.h
new file mode 100644
index 0000000..39b7448
--- /dev/null
+++ b/src/drv/ps1/irq/private_include/drv/ps1/irq/routines.h
@@ -0,0 +1,24 @@
+/*
+ * 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_IRQ_ROUTINES_H
+#define DRV_PS1_IRQ_ROUTINES_H
+
+void drv_ps1_irq_handler(void);
+
+#endif
diff --git a/src/drv/ps1/irq/private_include/drv/ps1/irq/types.h b/src/drv/ps1/irq/private_include/drv/ps1/irq/types.h
new file mode 100644
index 0000000..6c5a185
--- /dev/null
+++ b/src/drv/ps1/irq/private_include/drv/ps1/irq/types.h
@@ -0,0 +1,26 @@
+/*
+ * 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_IRQ_TYPES_H
+#define DRV_PS1_IRQ_TYPES_H
+
+#include <drv/ps1/irq.h>
+
+extern struct drv_ps1_irq_src *drv_ps1_irq_head;
+
+#endif
diff --git a/src/drv/ps1/irq/src/CMakeLists.txt b/src/drv/ps1/irq/src/CMakeLists.txt
new file mode 100644
index 0000000..3823f4e
--- /dev/null
+++ b/src/drv/ps1/irq/src/CMakeLists.txt
@@ -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/>.
+
+target_sources(drv_ps1_irq PRIVATE
+    handler.c
+    head.c
+    init.c
+    set.c
+)
diff --git a/src/drv/ps1/irq/src/handler.c b/src/drv/ps1/irq/src/handler.c
new file mode 100644
index 0000000..0861852
--- /dev/null
+++ b/src/drv/ps1/irq/src/handler.c
@@ -0,0 +1,32 @@
+/*
+ * 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/irq.h>
+#include <drv/ps1/irq/routines.h>
+#include <drv/ps1/irq/types.h>
+#include <drv/ps1/bios.h>
+#include <stddef.h>
+
+void drv_ps1_irq_handler(void)
+{
+    for (struct drv_ps1_irq_src *s = drv_ps1_irq_head; s; s = s->next)
+        if (I_STAT->mask & s->mask)
+            s->fn();
+
+    ReturnFromException();
+}
diff --git a/src/drv/ps1/irq/src/head.c b/src/drv/ps1/irq/src/head.c
new file mode 100644
index 0000000..cde1fd8
--- /dev/null
+++ b/src/drv/ps1/irq/src/head.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/irq.h>
+#include <drv/ps1/irq/types.h>
+
+struct drv_ps1_irq_src *drv_ps1_irq_head;
diff --git a/src/drv/ps1/irq/src/init.c b/src/drv/ps1/irq/src/init.c
new file mode 100644
index 0000000..9e92b01
--- /dev/null
+++ b/src/drv/ps1/irq/src/init.c
@@ -0,0 +1,40 @@
+/*
+ * 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/irq.h>
+#include <drv/ps1/irq/routines.h>
+#include <drv/ps1/bios.h>
+#include <setjmp.h>
+
+int drv_ps1_irq_init(void)
+{
+    static jmp_buf jmp;
+    static char stack[128];
+    const int critical = EnterCriticalSection();
+
+    if (SaveState(jmp))
+        drv_ps1_irq_handler();
+
+    jmp->sp = (unsigned)stack + sizeof stack - 4;
+    SetCustomExitFromException(jmp);
+
+    if (critical)
+        ExitCriticalSection();
+
+    return 0;
+}
diff --git a/src/drv/ps1/irq/src/set.c b/src/drv/ps1/irq/src/set.c
new file mode 100644
index 0000000..35c5ed0
--- /dev/null
+++ b/src/drv/ps1/irq/src/set.c
@@ -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/>.
+ */
+
+#include <drv/ps1/irq.h>
+#include <drv/ps1/irq/types.h>
+#include <drv/ps1/bios.h>
+
+int drv_ps1_irq_set(struct drv_ps1_irq_src *const src)
+{
+    if (!drv_ps1_irq_head)
+        drv_ps1_irq_head = src;
+    else
+        for (struct drv_ps1_irq_src *s = drv_ps1_irq_head; s; s = s->next)
+            if (!s->next)
+            {
+                s->next = src;
+                break;
+            }
+
+    return 0;
+}