77 lines
1.8 KiB
C
77 lines
1.8 KiB
C
/* $Id$ */
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/* Copyright (c) 2025 Pierre Pronchery <khorben@defora.org> */
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/* This file is part of DeforaOS uKernel */
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#include <stdio.h>
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#ifndef vaddr_t
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# define vaddr_t unsigned long
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#endif
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#include "../src/loader/gdt.c"
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#if defined(__amd64__) || defined(__i386__)
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/* variables */
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static TSS tss;
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/* functions */
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/* __arch_setgdt */
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void __arch_setgdt(GDTEntry const * entries, size_t count)
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{
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size_t i;
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GDTEntry const * entry;
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printf("sizeof(*entries) => %zu\n", sizeof(*entries));
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for(i = 0; i < count; i++)
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{
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entry = &entries[i];
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printf("base=0x%02x%02x%02x%02x ",
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entry->base3, entry->base2,
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entry->base1, entry->base0);
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printf("limit=0x%x%02x%02x ",
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entry->limit2, entry->limit1, entry->limit0);
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printf("access=0x%02x ", entry->access);
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printf("flags=0x%0x\n", entry->flags);
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}
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printf("count=0x%zx => size=0x%zx\n", count, (count << 3) - 1);
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}
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#endif
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/* main */
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int main(int argc, char * argv[])
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{
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#if defined(__amd64__) || defined(__i386__)
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GDT * gdt;
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(void) argc;
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(void) argv;
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printf("sizeof(GDTEntry) = %zu (expected: %u)\n\n",
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sizeof(GDTEntry), 8);
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/* flat 4 GB */
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printf("Flat 4 GB:\n");
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gdt = gdt_init();
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gdt_append(gdt, 0x00000000, 0xffffffff, GDT_PROT_READ | GDT_PROT_EXEC);
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gdt_append(gdt, 0x00000000, 0xffffffff, GDT_PROT_READ | GDT_PROT_WRITE);
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gdt_append_system(gdt, &tss, sizeof(tss), GDT_SYSTEM_TYPE_TSS);
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gdt_apply(gdt);
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/* 4 MB code + 4 MB data (read-write) + 4 MB data (read-only) */
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printf("\n4 MB (rx) + 4 MB (rw) + 4 MB (ro):\n");
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gdt = gdt_init();
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gdt_append(gdt, 0x00400000, 0x00400000, GDT_PROT_READ | GDT_PROT_EXEC);
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gdt_append(gdt, 0x00800000, 0x00400000, GDT_PROT_READ | GDT_PROT_WRITE);
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gdt_append(gdt, 0x00c00000, 0x00400000, GDT_PROT_READ);
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gdt_append_system(gdt, &tss, sizeof(tss), GDT_SYSTEM_TYPE_TSS);
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gdt_apply(gdt);
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#endif
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(void) argc;
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(void) argv;
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return 0;
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}
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