program loading, others

big kernel additions: paging, elf loading, separate kernel and user page allocation
it now properly loads and runs sd0:bin/init.elf
still need to determine which disk was booted from, and start the init on that disk

1 files changed, 139 insertions, 0 deletions

diff --git a/src/user/include/pland/syscall.h b/src/user/include/pland/syscall.h
new file mode 100644
index 0000000..01f7151
--- /dev/null
+++ b/src/user/include/pland/syscall.h
@@ -0,0 +1,139 @@
+#ifndef PLAND_SYSCALL_H
+#define PLAND_SYSCALL_H
+
+#include <stdint.h>
+
+typedef uint32_t _file_handle_t;
+typedef uint32_t _task_handle_t;
+typedef uint32_t _drive_number_t;
+typedef enum {
+  _KEY_BACKSPACE = '\b',
+  _KEY_RETURN    = '\n',
+  //etc.
+
+  _KEY_LSHIFT = 0x00000100,
+  _KEY_RSHIFT = 0x00000200,
+  _KEY_CAPS   = 0x00000400,
+  _KEY_INSERT = 0x00000800,
+  _KEY_NUM    = 0x00001000,
+  _KEY_SCROLL = 0x00002000,
+  _KEY_LALT   = 0x00004000,
+  _KEY_RALT   = 0x00008000,
+  _KEY_LCTRL  = 0x00010000,
+  _KEY_RCTRL  = 0x00020000,
+  _KEY_LMETA  = 0x00040000,
+  _KEY_RMETA  = 0x00080000,
+
+  _KEY_SHIFT  = 0x00000300,
+  _KEY_SCAPS  = 0x00000700,
+  _KEY_ALT    = 0x0000c000,
+  _KEY_CTRL   = 0x00030000,
+  _KEY_META   = 0x000c0000,
+} _key_code_t;
+
+enum _scn {
+  _SCN_OPEN_FILE,
+  _SCN_CLOSE_FILE,
+  _SCN_FILE_READ,
+  _SCN_FILE_SIZE,
+  _SCN_START_TASK,
+  _SCN_LOG_STRING,
+  _SCN_GET_KEY,
+  _SCN_ALLOCATE_RAM
+};
+
+static inline uint32_t _sc0(enum _scn eax) {
+  volatile uint32_t out;
+  asm (
+    "int $0x30"
+  : "=a" (out) : "a" (eax) : "ecx", "edx");
+  return out;
+}
+
+static inline uint32_t _sc1(enum _scn eax, uint32_t ebx) {
+  volatile uint32_t out;
+  asm (
+    "int $0x30"
+  : "=a" (out) : "a" (eax), "b" (ebx) : "ecx", "edx");
+  return out;
+}
+
+static inline uint32_t _sc2(enum _scn eax, uint32_t ebx, uint32_t ecx) {
+  volatile uint32_t out;
+  asm (
+    "int $0x30"
+  : "=a" (out) : "a" (eax), "b" (ebx), "c" (ecx) : "edx");
+  return out;
+}
+
+static inline uint32_t _sc3(enum _scn eax, uint32_t ebx, uint32_t ecx, uint32_t edx) {
+  volatile uint32_t out;
+  asm (
+    "int $0x30"
+  : "=a" (out) : "a" (eax), "b" (ebx), "c" (ecx), "d" (edx));
+  return out;
+}
+
+static inline uint32_t _sc4(enum _scn eax, uint32_t ebx, uint32_t ecx, uint32_t edx, uint32_t esi) {
+  volatile uint32_t out;
+  asm (
+    "int $0x30"
+  : "=a" (out) : "a" (eax), "b" (ebx), "c" (ecx), "d" (edx), "S" (esi));
+  return out;
+}
+
+static inline uint32_t _sc5(enum _scn eax, uint32_t ebx, uint32_t ecx, uint32_t edx, uint32_t esi, uint32_t edi) {
+  volatile uint32_t out;
+  asm (
+    "int $0x30"
+  : "=a" (out) : "a" (eax), "b" (ebx), "c" (ecx), "d" (edx), "S" (esi), "D" (edi));
+  return out;
+}
+
+static inline void _yield_task() {
+  asm (
+    "int $0x39"
+  );
+}
+
+__attribute__ ((noreturn))
+static inline void _exit_task() {
+  asm (
+    "int $0x38"
+  );
+  __builtin_unreachable();
+}
+
+static inline _file_handle_t _open_file(_drive_number_t drive_number, const char *path) {
+  return _sc2(_SCN_OPEN_FILE, drive_number, (uint32_t)path);
+}
+
+static inline void _close_file(_file_handle_t handle) {
+  _sc1(_SCN_CLOSE_FILE, handle);
+}
+
+static inline uint32_t _file_read(_file_handle_t handle, uint32_t file_offset, uint32_t count, void *buffer) {
+  return _sc4(_SCN_FILE_READ, handle, file_offset, count, (uint32_t)buffer);
+}
+
+static inline uint32_t _file_size(_file_handle_t handle) {
+  return _sc1(_SCN_FILE_SIZE, handle);
+}
+
+static inline void _start_task(_drive_number_t drive_number, char *path) {
+  _sc2(_SCN_START_TASK, drive_number, (uint32_t)path);
+}
+
+static inline void _log_string(const char *sz) {
+  _sc1(_SCN_LOG_STRING, (uint32_t)sz);
+}
+
+static inline _key_code_t _get_key() {
+  return _sc0(_SCN_GET_KEY);
+}
+
+static inline void *_allocate_ram(uint32_t pages) {
+  return (void *)_sc1(_SCN_ALLOCATE_RAM, pages);
+}
+
+#endif
\ No newline at end of file