| /* |
| * Our pretty trivial BIOS emulation |
| */ |
| |
| #include <kvm/bios.h> |
| #include <kvm/assembly.h> |
| |
| .org 0 |
| .code16gcc |
| |
| #include "macro.S" |
| |
| /* |
| * fake interrupt handler, nothing can be faster ever |
| */ |
| ENTRY(bios_intfake) |
| IRET |
| ENTRY_END(bios_intfake) |
| |
| /* |
| * int 10 - video - write character and advance cursor (tty write) |
| * ah = 0eh |
| * al = character |
| * bh = display page (alpha modes) |
| * bl = foreground color (graphics modes) |
| * |
| * We ignore bx settings |
| */ |
| ENTRY(bios_int10) |
| pushw %fs |
| pushl %es |
| pushl %edi |
| pushl %esi |
| pushl %ebp |
| pushl %esp |
| pushl %edx |
| pushl %ecx |
| pushl %ebx |
| pushl %eax |
| |
| movl %esp, %eax |
| /* this is way easier than doing it in assembly */ |
| /* just push all the regs and jump to a C handler */ |
| call int10_handler |
| |
| popl %eax |
| popl %ebx |
| popl %ecx |
| popl %edx |
| popl %esp |
| popl %ebp |
| popl %esi |
| popl %edi |
| popl %es |
| popw %fs |
| |
| IRET |
| |
| |
| /* |
| * private IRQ data |
| */ |
| cursor: .long 0 |
| ENTRY_END(bios_int10) |
| |
| #define EFLAGS_CF (1 << 0) |
| |
| ENTRY(bios_int15) |
| cmp $0xE820, %eax |
| jne 1f |
| |
| pushw %fs |
| |
| pushl %edx |
| pushl %ecx |
| pushl %edi |
| pushl %ebx |
| pushl %eax |
| |
| movl %esp, %eax # it's bioscall case |
| call e820_query_map |
| |
| popl %eax |
| popl %ebx |
| popl %edi |
| popl %ecx |
| popl %edx |
| |
| popw %fs |
| |
| /* Clear CF */ |
| andl $~EFLAGS_CF, 0x4(%esp) |
| 1: |
| IRET |
| ENTRY_END(bios_int15) |
| |
| GLOBAL(__locals) |
| |
| #include "local.S" |
| |
| END(__locals) |
