Espresso 0.0.2c

2026-03-20 16:57:08 -05:00
parent 021fdbbcef
commit 5971218b56
77 changed files with 4538 additions and 518 deletions
--- a/kernel/syscall.c
+++ b/kernel/syscall.c
@ -0,0 +1,118 @@
+#include <stdio.h>
+#include <drivers/irq.h>
+
+#include <mm/pmm.h>
+#include <mm/paging.h>
+
+#include <tty.h>
+
+#include <drivers/serio.h>
+
+#include <kernel/syscall.h>
+
+
+/*
+Espresso has two types of syscalls.
+
+one: int 16, the only one I've worked on. should be able to be used in kernel code and user-space.
+two: syscall/sysenter, the ones I haven't worked on because it has to do with userspace code.
+*/
+
+
+/*
+NOTE: passing arguments to fuctions
+to pass args to functions, use all registers except eax,
+so ebx is arg0, ecx arg1, edx arg2, esi arg3, edi arg4, ebp arg5
+*/
+
+void init_sysints(void)
+{
+  /* actually nothing to do */
+  
+  set_irq_handler(16, (irq_func_t) int16_handler);
+}
+
+/* 0 in eax means success most of the time */
+registers_t* int16_handler(registers_t* regs)
+{
+  //printf("eax: %0x%x\n", regs->eax);
+
+  uint32_t eax = regs->eax;
+
+  if (eax >= __ENUM_END_MARKER__)
+  {
+    printf("Invalid system call %i\n", eax);
+    return regs;
+  }
+  
+  switch (eax)
+  {
+    case SYS_MAP_PAGE:
+      map_page((void*) regs->ebx, (void*) regs->ecx);
+      break;
+    case SYS_PMM_ALLOC_PAGE:
+      eax = (uint32_t) pmm_alloc_page();
+      break;
+    case SYS_PMM_FREE_PAGE:
+      pmm_free_page((void*) regs->ebx);
+      break;
+    case SYS_SERIAL_WRITE:
+      serial_write(regs->ebx);
+      break;
+    case SYS_SERIAL_READ:
+      eax = serial_read();
+      break;
+    case SYS_SERIAL_PUTS:
+      serial_puts((const char*) regs->ebx);
+      break;
+    case SYS_USE_SERIAL:
+      eax = use_serial();
+      break;
+    case SYS_TERMINAL_SCROLL:
+      terminal_scroll();
+      break;
+    case SYS_TERMINAL_CLEAR:
+      terminal_clear();
+      break;
+    case SYS_TERMINAL_SET_CURSOR:
+      terminal_set_cursor(regs->ebx, regs->ecx);
+      break;
+    case SYS_TERMINAL_GET_CURSOR:
+      terminal_get_cursor((int*) regs->ebx, (int*) regs->ecx);
+      break;
+    case SYS_TERMINAL_WRITE:
+      terminal_write((const char*) regs->ebx, regs->ecx);
+      break;
+    case SYS_TERMINAL_WRITESTRING:
+      terminal_writestring((const char*) regs->ebx);
+      break;
+    case SYS_TERMINAL_DEBUG_WRITESTRING:
+      terminal_debug_writestring((const char*) regs->ebx);
+      break;
+    case SYS_TERMINAL_PUTCHAR:
+      terminal_putchar(regs->ebx);
+      break;
+    case SYS_TERMINAL_PUTENTRYAT:
+      terminal_putentryat(regs->ebx, regs->ecx, regs->edx, regs->esi);
+      break;
+    case SYS_TERMINAL_GETCOLOR:
+      eax = terminal_getcolor();
+      break;
+    case SYS_TERMINAL_SETCOLOR:
+      terminal_setcolor(regs->ebx);
+      break;
+    case SYS_READ:
+      eax = read(regs->ebx, (void*) regs->ecx, regs->edx);
+      break;
+    case SYS_WRITE:
+      eax = write(regs->ebx, (void*) regs->ecx, regs->edx);
+      break;
+    default:
+      printf("nothing happened.\n");
+      break;
+  }
+
+  regs->eax = eax;
+  
+  return regs;
+}