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tests: import a test tool for the GDT

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This commit is contained in:
Pierre Pronchery 2025-03-20 03:45:38 +01:00
parent ec0bef8573
commit fb07c0b7ce
2 changed files with 80 additions and 1 deletions
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69
tests/gdt.c Normal file
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@ -0,0 +1,69 @@
/* $Id$ */
/* Copyright (c) 2025 Pierre Pronchery <khorben@defora.org> */
/* This file is part of DeforaOS uKernel */
#include <stdio.h>
#ifndef vaddr_t
# define vaddr_t unsigned long
#endif
#include "../src/loader/gdt.c"
#if defined(__amd64__) || defined(__i386__)
/* __arch_setgdt */
void __arch_setgdt(GDTEntry const * entries, size_t count)
{
size_t i;
GDTEntry const * entry;
printf("sizeof(*entries) => %zu\n", sizeof(*entries));
for(i = 0; i < count; i++)
{
entry = &entries[i];
printf("base=0x%02x%02x%02x%02x ",
entry->base3, entry->base2,
entry->base1, entry->base0);
printf("limit=0x%x%02x%02x ",
entry->limit2, entry->limit1, entry->limit0);
printf("access=0x%02x ", entry->access);
printf("flags=0x%0x\n", entry->flags);
}
printf("count=0x%zx => size=0x%zx\n", count, (count << 3) - 1);
}
#endif
/* main */
int main(int argc, char * argv[])
{
#if defined(__amd64__) || defined(__i386__)
GDT * gdt;
(void) argc;
(void) argv;
printf("sizeof(GDTEntry) = %zu (expected: %u)\n\n",
sizeof(GDTEntry), 8);
/* flat 4 GB */
printf("Flat 4 GB:\n");
gdt = gdt_init();
gdt_append(gdt, 0x00000000, 0xffffffff, PROT_READ | PROT_EXEC);
gdt_append(gdt, 0x00000000, 0xffffffff, PROT_READ | PROT_WRITE);
gdt_apply(gdt);
/* 4 MB code + 4 MB data (read-write) + 4 MB data (read-only) */
printf("\n4 MB (rx) + 4 MB (rw) + 4 MB (ro):\n");
gdt = gdt_init();
gdt_append(gdt, 0x00400000, 0x00400000, PROT_READ | PROT_EXEC);
gdt_append(gdt, 0x00800000, 0x00400000, PROT_READ | PROT_WRITE);
gdt_append(gdt, 0x00c00000, 0x00400000, PROT_READ);
gdt_apply(gdt);
#endif
(void) argc;
(void) argv;
return 0;
}

12
tests/project.conf
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@ -1,4 +1,6 @@
targets=clint.log,distcheck.log,fixme.log,grub.log
targets=clint.log,distcheck.log,fixme.log,gdt,grub.log
cppflags_force=-I../src
cflags_force=-W -Wall -g -O2
dist=Makefile,clint.sh,distcheck.sh,fixme.sh,grub.sh
#targets
@ -20,8 +22,16 @@ script=./fixme.sh
depends=fixme.sh
enabled=0
[gdt]
type=binary
sources=gdt.c
[grub.log]
type=script
script=./grub.sh
depends=$(OBJDIR)../src/kernel/uKernel.bin,grub.sh
enabled=0
#sources
[gdt.c]
depends=../src/loader/gdt.c,../src/arch/amd64/gdt.h,../src/arch/i386/gdt.h