38 lines
1 KiB
C
38 lines
1 KiB
C
#include <stdint.h>
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#include <stddef.h>
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#include <debugging.h>
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#include <kernel/tty.h>
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#include <kernel/gdt.h>
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#include <debugging.h>
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static void* memcpy(void* restrict dstptr, const void* restrict srcptr, size_t size) {
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unsigned char* dst = (unsigned char*) dstptr;
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const unsigned char* src = (const unsigned char*) srcptr;
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for (size_t i = 0; i < size; i++)
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dst[i] = src[i];
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return dstptr;
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}
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void run_program(uint8_t* program, size_t length)
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{
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uint8_t* userland_code = (uint8_t*) 0x0;
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memcpy(userland_code, program, length);
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print_hex_bytes(userland_code, 1);
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terminal_putchar('\n');
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asm ("\
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mov $0x20 | 0x3, %%ax;\
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movw %%ax, %%ds;\
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movw %%ax, %%es;\
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movw %%ax, %%fs;\
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movw %%ax, %%gs;\
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pushl $0x20 | 0x3; /* SS selector */ \
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pushl $0x00c00100; /* ESP */ \
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pushf; /* EFLAGS */ \
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popl %%eax; orl $0x200, %%eax; pushl %%eax; /* Set interrupts in USERPACE */\
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pushl $0x18 | 0x3; /* CS selector */\
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pushl $0x0; /* EIP */ \
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iret;":::"eax");
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}
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