kern/amd64: cpu: Make GDT per-cpu to match TSS

Signed-off-by: Ian Moffett <ian@osmora.org>

3 files changed, 17 insertions, 7 deletions

diff --git a/src/sys/arch/amd64/boot/boot_chip.c b/src/sys/arch/amd64/boot/boot_chip.c
index 2ff122c..76753d5 100644
--- a/src/sys/arch/amd64/boot/boot_chip.c
+++ b/src/sys/arch/amd64/boot/boot_chip.c
@@ -61,8 +61,10 @@ static void
 init_tss(struct pcore *pcore)
 {
     struct tss_desc *desc;
+    struct mdcore *mdcore;
 
-    desc = (struct tss_desc *)&g_gdt_data[GDT_TSS_INDEX];
+    mdcore = &pcore->md;
+    desc = (struct tss_desc *)&mdcore->gdt[GDT_TSS_INDEX];
     write_tss(pcore, desc);
     tss_load();
 }
diff --git a/src/sys/arch/amd64/boot/boot_gdt.c b/src/sys/arch/amd64/boot/boot_gdt.c
index 2c1ada6..64b3f2b 100644
--- a/src/sys/arch/amd64/boot/boot_gdt.c
+++ b/src/sys/arch/amd64/boot/boot_gdt.c
@@ -91,8 +91,3 @@ struct gdt_entry g_gdt_data[GDT_ENTRY_COUNT] = {
 
 /* Verify that the GDT is of the correct size */
 __static_assert(sizeof(g_gdt_data) == (8 * GDT_ENTRY_COUNT));
-
-const struct gdtr g_gdtr = {
-    .limit = sizeof(g_gdt_data) - 1,
-    .offset = (uintptr_t)&g_gdt_data[0]
-};
diff --git a/src/sys/arch/amd64/cpu/cpu_conf.c b/src/sys/arch/amd64/cpu/cpu_conf.c
index 5eb1cbe..e462ef3 100644
--- a/src/sys/arch/amd64/cpu/cpu_conf.c
+++ b/src/sys/arch/amd64/cpu/cpu_conf.c
@@ -34,6 +34,7 @@
 #include <machine/trap.h>
 #include <machine/lapic.h>
 #include <machine/gdt.h>
+#include <string.h>
 
 /*
  * Initialize interrupt vectors
@@ -58,8 +59,20 @@ init_vectors(void)
 void
 cpu_conf(struct pcore *pcore)
 {
+    struct mdcore *mdcore;
+    struct gdtr *gdtr;
+
+    /* Copy the template GDT */
+    mdcore = &pcore->md;
+    memcpy(mdcore->gdt, &g_gdt_data, sizeof(g_gdt_data));
+
+    /* Set up the GDTR */
+    gdtr = &mdcore->gdtr;
+    gdtr->offset = (uintptr_t)&mdcore->gdt[0];
+    gdtr->limit = sizeof(g_gdt_data) - 1;
+
     /* We use %GS to store the processor */
-    gdt_load();
+    gdt_load(&mdcore->gdtr);
     pcore->self = pcore;
     wrmsr(IA32_GS_BASE, (uintptr_t)pcore);