From ace65b453151845bc361f21f3e5b651c35f9f126 Mon Sep 17 00:00:00 2001
From: Jon Santmyer <jon@jonsantmyer.com>
Date: Wed, 22 May 2024 13:00:41 -0400
Subject: massive refactor for mp and organization

---
 arch/x86_64/gdt.c | 83 ++++++++++++++++++++++---------------------------------
 1 file changed, 33 insertions(+), 50 deletions(-)

(limited to 'arch/x86_64/gdt.c')

diff --git a/arch/x86_64/gdt.c b/arch/x86_64/gdt.c
index 07a8097..614ec30 100644
--- a/arch/x86_64/gdt.c
+++ b/arch/x86_64/gdt.c
@@ -1,24 +1,10 @@
-#include "tables.h"
-#include "tss.h"
+#include "arch/x86_64/gdt.h"
+#include "arch/x86_64/tss.h"
+#include "arch/processor.h"
+#include "string.h"
+#include "print.h"
 
-enum
-{
-    GDT_SEGMENT_KERNEL_NULL = 0,
-    GDT_SEGMENT_KERNEL_CODE,
-    GDT_SEGMENT_KERNEL_DATA,
-
-    GDT_SEGMENT_USER_NULL,
-    GDT_SEGMENT_USER_DATA,
-    GDT_SEGMENT_USER_CODE,
-
-    GDT_SEGMENT_TSS_LOW,
-    GDT_SEGMENT_TSS_HIGH,
-
-    GDT_SEGMENT_COUNT
-};
-
-__attribute__((aligned(0x1000)))
-static struct SegmentDescriptor s_gdtd[GDT_SEGMENT_COUNT] =
+static gdt_t s_baseline_gdt =
 {
     { 0 },  /* Kernel NULL */
     {       /* Kernel Code (64-bit RO EX DPL0) */
@@ -99,43 +85,40 @@ static struct SegmentDescriptor s_gdtd[GDT_SEGMENT_COUNT] =
     },
     { 0 }
 };
-static struct XDTR s_gdtr = {
-    .length = sizeof(s_gdtd) - 1,
-    .address = (uintptr_t)&s_gdtd
-};
 
-static struct TSS s_tss = {
-    
-};
-
-extern void x86_64_lgdt(struct XDTR *gdtr);
-extern void x86_64_flush_tss(void);
 void
-x86_64_load_gdt(void)
+gdt_setup(processor_t *proc)
 {
-    {
-        struct SegmentDescriptor *tss_lo = &s_gdtd[GDT_SEGMENT_TSS_LOW];
-        struct SegmentDescriptor *tss_hi = &s_gdtd[GDT_SEGMENT_TSS_HIGH];
-        uintptr_t tssb = (uintptr_t)&s_tss;
-        tss_lo->base_0_15 = tssb & 0xFFFF;
-        tss_lo->base_16_23 = (tssb >> 16) & 0xFF;
-        tss_lo->base_24_31 = (tssb >> 24) & 0xFF;
-        tss_hi->limit_0_15 = (tssb >> 32) & 0xFFFF;
-        tss_hi->base_0_15 = (tssb >> 48) & 0xFFFF;
+    memcpy(proc->_gdt, s_baseline_gdt, sizeof(gdt_t));
+    proc->_gdtr = (struct XDTR) {
+        .length = sizeof(gdt_t) - 1,
+        .address = (uintptr_t)&proc->_gdt
+    };
+    klogf("Processor %i GDT %#016X L%i\n", proc->id, proc->_gdt, proc->_gdtr.length);
+}
 
-        size_t tssl = sizeof(struct TSS) - 1;
-        tss_lo->limit_0_15 = tssl & 0xFFFF;
-        tss_lo->limit_16_19 = (tssl >> 16) & 0xF;
+void
+tss_setup(processor_t *proc)
+{
+    segment_descriptor_t *tss_lo = &proc->_gdt[GDT_SEGMENT_TSS_LOW];
+    segment_descriptor_t *tss_hi = &proc->_gdt[GDT_SEGMENT_TSS_HIGH];
+    uintptr_t tssb = (uintptr_t)&(proc->_tss);
+    tss_lo->base_0_15 = tssb & 0xFFFF;
+    tss_lo->base_16_23 = (tssb >> 16) & 0xFF;
+    tss_lo->base_24_31 = (tssb >> 24) & 0xFF;
+    tss_hi->limit_0_15 = (tssb >> 32) & 0xFFFF;
+    tss_hi->base_0_15 = (tssb >> 48) & 0xFFFF;
 
-        s_tss.iobp = sizeof(struct TSS);
-    }
+    size_t tssl = sizeof(struct TSS) - 1;
+    tss_lo->limit_0_15 = tssl & 0xFFFF;
+    tss_lo->limit_16_19 = (tssl >> 16) & 0xF;
 
-    x86_64_lgdt(&s_gdtr);
-    x86_64_flush_tss();
+    proc->_tss.iobp = sizeof(struct TSS);
 }
 
-void tss_set_rsp(uint8_t dpl, uintptr_t rsp)
+void
+tss_set_rsp(struct TSS *tss, uint8_t dpl, uintptr_t rsp)
 {
-    s_tss.rsp[dpl][0] = rsp & 0xFFFFFFFF;
-    s_tss.rsp[dpl][1] = (rsp >> 32) & 0xFFFFFFFF;
+    tss->rsp[dpl][0] = rsp & 0xFFFFFFFF;
+    tss->rsp[dpl][1] = (rsp >> 32) & 0xFFFFFFFF;
 }
-- 
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