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authorMarvin Borner2019-09-19 19:56:59 +0200
committerMarvin Borner2019-09-19 20:05:38 +0200
commit05e1fedcc9cd30d1a34a65e640da45e980b4f859 (patch)
tree9cfb7620907ac126f26cdfe9363cb73ed74ea179 /src/gdt/gdt.c
parentffd82e18b5259fab477ad375a7af8550fac526d8 (diff)
Moved source to kernel directory
Diffstat (limited to 'src/gdt/gdt.c')
-rw-r--r--src/gdt/gdt.c51
1 files changed, 0 insertions, 51 deletions
diff --git a/src/gdt/gdt.c b/src/gdt/gdt.c
deleted file mode 100644
index 813b432..0000000
--- a/src/gdt/gdt.c
+++ /dev/null
@@ -1,51 +0,0 @@
-struct gdt_entry {
- unsigned short limit_low;
- unsigned short base_low;
- unsigned char base_middle;
- unsigned char access;
- unsigned char granularity;
- unsigned char base_high;
-} __attribute__((packed));
-
-struct gdt_ptr {
- unsigned short limit;
- unsigned int base;
-} __attribute__((packed));
-
-struct gdt_entry gdt[3];
-struct gdt_ptr gp;
-
-extern void gdt_flush();
-
-void gdt_set_gate(int num, unsigned long base, unsigned long limit, unsigned char access, unsigned char gran) {
- // Set descriptor base address
- gdt[num].base_low = (base & 0xFFFF);
- gdt[num].base_middle = (base >> 16) & 0xFF;
- gdt[num].base_high = (base >> 24) & 0xFF;
-
- // Set descriptor limits
- gdt[num].limit_low = (limit & 0xFFFF);
- gdt[num].granularity = ((limit >> 16) & 0x0F);
-
- // Set granularity and access flags
- gdt[num].granularity |= (gran & 0xF0);
- gdt[num].access = access;
-}
-
-void gdt_install() {
- // Set GDT pointer and limit
- gp.limit = (sizeof(struct gdt_entry) * 3) - 1;
- gp.base = &gdt;
-
- // NULL descriptor
- gdt_set_gate(0, 0, 0, 0, 0);
-
- // Code segment
- gdt_set_gate(1, 0, 0xFFFFFFFF, 0x9A, 0xCF);
-
- // Data segment
- gdt_set_gate(2, 0, 0xFFFFFFFF, 0x92, 0xCF);
-
- // Remove old GDT and install the new changes!
- gdt_flush();
-} \ No newline at end of file