diff options
Diffstat (limited to 'cpu/i386/interrupts.c')
| -rw-r--r-- | cpu/i386/interrupts.c | 67 |
1 files changed, 19 insertions, 48 deletions
diff --git a/cpu/i386/interrupts.c b/cpu/i386/interrupts.c index 81d6881..614d408 100644 --- a/cpu/i386/interrupts.c +++ b/cpu/i386/interrupts.c @@ -29,22 +29,6 @@ #include <asm/ibmpc.h> -#if 0 -/* done */ -int interrupt_init (void); -void irq_install_handler(int, interrupt_handler_t *, void *); -void irq_free_handler (int); -void enable_interrupts (void); -int disable_interrupts (void); - -/* todo */ -void timer_interrupt (struct pt_regs *); -void external_interrupt (struct pt_regs *); -void reset_timer (void); -ulong get_timer (ulong base); -void set_timer (ulong t); - -#endif struct idt_entry { u16 base_low; @@ -76,43 +60,30 @@ typedef struct { static irq_desc_t irq_table[MAX_IRQ]; -/* syscall stuff, very untested - * the current approach which includes copying - * part of the stack will work badly for - * varargs functions. - * if we were to store the top three words on the - * stack (eip, ss, eflags) somwhere and add 14 to - * %esp .... - */ + asm(".globl syscall_entry\n" \ "syscall_entry:\n" \ - "movl 12(%esp), %eax\n" \ - "movl %esp, %ebx\n" \ - "addl $16, %ebx\n" \ - "pushl %ebx\n" \ - "pushl %eax\n" \ - "call do_syscall\n" \ - "addl $8, %esp\n" \ - "iret\n"); + "popl %ebx\n" /* throw away the return address, flags */ \ + "popl %ebx\n" /* and segment that the INT instruction pushed */ \ + "popl %ebx\n" /* on to the stack */ \ + "movl %eax, %ecx\n" /* load the syscall nr argument*/ \ + "movl syscall_tbl, %eax\n" /* load start of syscall table */ \ + "cmpl $(11-1), %ecx\n" /* FixMe: find a way to use NR_SYSCALLS macro here */ \ + "ja bad_syscall\n" \ + "movl (%eax, %ecx, 4), %eax\n" /* load the handler of the syscall*/ \ + "test %eax, %eax\n" /* test for null */ \ + "je bad_syscall\n" \ + "popl %ecx\n" \ + "popl %ebx\n" \ + "sti \n" \ + "jmp *%eax\n" \ +"bad_syscall: movl $0xffffffff, %eax\n" \ + "popl %ecx\n" \ + "popl %ebx\n" \ + "ret"); void __attribute__ ((regparm(0))) syscall_entry(void); -int __attribute__ ((regparm(0))) do_syscall(u32 nr, u32 *stack) -{ - if (nr<NR_SYSCALLS) { - /* We copy 8 args of the syscall, - * this will be a problem with the - * printf syscall .... */ - int (*fp)(u32, u32, u32, u32, - u32, u32, u32, u32); - fp = syscall_tbl[nr]; - return fp(stack[0], stack[1], stack[2], stack[3], - stack[4], stack[5], stack[6], stack[7]); - } - - return -1; -} - asm ("irq_return:\n" " addl $4, %esp\n" |