Random stuff.

[polintos/scott/priv.git] / kernel / arch / x86 / descriptors.cc

diff --git a/kernel/arch/x86/descriptors.cc b/kernel/arch/x86/descriptors.cc
index 8619e1c01d7cf027958b2f2b172a6bce3a2ab705..172e4e42bfbeb25c2032bf9e4b3689c10c868028 100644 (file)
--- a/kernel/arch/x86/descriptors.cc
+++ b/kernel/arch/x86/descriptors.cc
@@ -29,7 +29,7 @@ using Arch::Priv::tss;
 
 Descriptor x86_gdt[1024] = {
        {}, // The first entry is reserved for the NULL selector.
-       {   // 0x08: data
+       {   // 0x08: kernel data
                limit_low: 0xffff,
                base_low: 0,
                base_mid: 0,
@@ -37,14 +37,14 @@ Descriptor x86_gdt[1024] = {
                user: 1,
                dpl: 0,
                present: 1,
-               limit_high: 0xff,
+               limit_high: 0xf,
                sw: 0,
                reserved: 0,
                opsize: 1,
                gran: 1,
                base_high: 0
        },
-       {   // 0x10: code
+       {   // 0x10: kernel code
                limit_low: 0xffff,
                base_low: 0,
                base_mid: 0,
@@ -52,7 +52,7 @@ Descriptor x86_gdt[1024] = {
                user: 1,
                dpl: 0,
                present: 1,
-               limit_high: 0xff,
+               limit_high: 0xf,
                sw: 0,
                reserved: 0,
                opsize: 1,
@@ -73,7 +73,37 @@ Descriptor x86_gdt[1024] = {
                opsize: 0,
                gran: 0,
                base_high: 0
-       }
+       },
+       {   // 0x23: user data
+               limit_low: 0xffff,
+               base_low: 0,
+               base_mid: 0,
+               type: 2, // data segment, writable
+               user: 1,
+               dpl: 3,
+               present: 1,
+               limit_high: 0x7,
+               sw: 0,
+               reserved: 0,
+               opsize: 1,
+               gran: 1,
+               base_high: 0
+       },
+       {   // 0x2b: code
+               limit_low: 0xffff,
+               base_low: 0,
+               base_mid: 0,
+               type: 10, // code segment, readable
+               user: 1,
+               dpl: 3,
+               present: 1,
+               limit_high: 0x7,
+               sw: 0,
+               reserved: 0,
+               opsize: 1,
+               gran: 1,
+               base_high: 0
+       },
 };
 
 struct X86DescriptorTablePointer {
@@ -152,7 +182,8 @@ static void set_int_gate(int num, void *addrptr, bool ints_off = false,
 }
 
 extern int x86_diverr, x86_debug, x86_breakpoint;
-extern int x86_gpf, x86_page_fault, x86_invalid_insn, x86_int99_entry;
+extern int x86_gpf, x86_page_fault, x86_invalid_insn;
+extern int x86_int98_entry, x86_int99_entry, x86_int9a_entry, x86_int9b_entry;
 extern void *x86_irqs[256];
 
 namespace Arch {
@@ -170,7 +201,10 @@ namespace Priv {
                set_int_gate(6, &x86_invalid_insn);
                set_int_gate(13, &x86_gpf);
                set_int_gate(14, &x86_page_fault, true);
-               set_int_gate(0x99, &x86_int99_entry);
+               set_int_gate(0x98, &x86_int98_entry, false, true);
+               set_int_gate(0x99, &x86_int99_entry, false, true);
+               set_int_gate(0x9a, &x86_int9a_entry, false, true);
+               set_int_gate(0x9b, &x86_int9b_entry, false, true);
                
                for (int i = 0x20; i < 0x30; i++)
                        set_int_gate(i, x86_irqs[i], true);