74 lines
1.5 KiB
C
74 lines
1.5 KiB
C
#include <syscall.h>
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#include <debug.h>
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#include <int.h>
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#include <msr.h>
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#include <gdt.h>
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#include <registers.h>
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#include "../../libc/syscall_num.h"
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#include <string.h>
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extern void syscall_entry();
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syscall_handler_t syscall_handlers[1024];
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SYSCALL_DECL(debug);
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registers_t *syscall_handler(registers_t *r)
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{
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// Syscall number: RAX
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// Order of arguments:
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// RDI
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// RSI
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// RDX
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// R10
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// R8
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// R9
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// stack
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//
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// Return value:
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// RAX
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if(syscall_handlers[r->rax])
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{
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r->rax = syscall_handlers[r->rax](r->rax, r->rdi, r->rsi, r->rdx, r->r10, r->r8, r->r9);
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return r;
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}
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debug_error("Unknown syscall, No:%d\n", r->rax);
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debug("syscall_%d(%x, %x, %x, %x, %x, %x)\n", r->rax, r->rdi, r->rsi, r->rdx, r->r10, r->r8, r->r9);
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for(;;);
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}
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int syscall_installed = 0;
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void syscall_init()
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{
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msr_write(MSR_REG_STAR, (((uint64_t)SEG_KDATA | 0x3)<<48 | ((uint64_t)SEG_KCODE)<<32));
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msr_write(MSR_REG_LSTAR, (uint64_t)syscall_entry);
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msr_write(MSR_REG_EFER, msr_read(MSR_REG_EFER)| 1);
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msr_write(MSR_REG_FMASK, RFLAGS_IF);
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if(!syscall_installed)
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{
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register_int_handler(INT_SYSCALL, syscall_handler);
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syscall_installed = 1;
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memset(syscall_handlers, 0, 1024*sizeof(syscall_handler_t));
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SYSCALL_REGISTER(debug, SYS_DEBUG);
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SYSCALL_REGISTER(write, SYS_WRITE);
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SYSCALL_REGISTER(brk, SYS_BRK);
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SYSCALL_REGISTER(fork, SYS_FORK);
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SYSCALL_REGISTER(exit, SYS_EXIT);
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SYSCALL_REGISTER(wait, SYS_WAIT);
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}
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}
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SYSCALL_DEF(debug)
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{
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SYSCALL_INIT(char*, message);
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debug_puts(message);
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return 0;
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}
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