rulimine/stage23/protos/multiboot1.32.c

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#include <stdint.h>
#include <stddef.h>
#include <stdbool.h>
#include <mm/vmm.h>
#if bios == 1
# include <sys/idt.h>
#endif
__attribute__((noreturn)) void multiboot1_spinup_32(
uint32_t entry_point, uint32_t multiboot1_info) {
#if bios == 1
struct idtr idtr;
idtr.limit = 0x3ff;
idtr.ptr = 0;
asm volatile (
"lidt %0"
:
: "m" (idtr)
: "memory"
);
#endif
asm volatile (
"cld\n\t"
"push %2\n\t"
"xor %%ecx, %%ecx\n\t"
"xor %%edx, %%edx\n\t"
"xor %%esi, %%esi\n\t"
"xor %%edi, %%edi\n\t"
"xor %%ebp, %%ebp\n\t"
"ret\n\t"
:
: "a" (0x2badb002),
"b" (multiboot1_info),
"r" (entry_point)
: "memory"
);
__builtin_unreachable();
}