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stivale1&2: Pass higher half GDTR.base when returning higher half pointers

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This commit is contained in:
mintsuki 2021-11-25 22:46:16 +01:00
parent 848d53e147
commit abea162c4b
5 changed files with 39 additions and 10 deletions
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10
stage23/protos/stivale.32.c
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@ -7,11 +7,13 @@ __attribute__((noreturn)) void stivale_spinup_32(
int bits, bool level5pg, bool enable_nx, uint32_t pagemap_top_lv,
uint32_t entry_point_lo, uint32_t entry_point_hi,
uint32_t stivale_struct_lo, uint32_t stivale_struct_hi,
uint32_t stack_lo, uint32_t stack_hi) {
uint32_t stack_lo, uint32_t stack_hi,
uint32_t local_gdt) {
uint64_t casted_to_64[] = {
(uint64_t)stivale_struct_lo | ((uint64_t)stivale_struct_hi << 32),
(uint64_t)entry_point_lo | ((uint64_t)entry_point_hi << 32),
(uint64_t)stack_lo | ((uint64_t)stack_hi << 32)
(uint64_t)stack_lo | ((uint64_t)stack_hi << 32),
(uint64_t)local_gdt
};
if (bits == 64) {
@ -70,8 +72,12 @@ __attribute__((noreturn)) void stivale_spinup_32(
// Move in 64-bit values
"movq 0x00(%%rsi), %%rdi\n\t"
"movq 0x08(%%rsi), %%rbx\n\t"
"movq 0x18(%%rsi), %%rax\n\t"
"movq 0x10(%%rsi), %%rsi\n\t"
// Load 64 bit GDT
"lgdt (%%rax)\n\t"
// Let's pretend we push a return address
"testq %%rsi, %%rsi\n\t"
"jz 1f\n\t"

21
stage23/protos/stivale.c
View File

@ -187,6 +187,17 @@ bool stivale_load(char *config, char *cmdline) {
uint64_t direct_map_offset = want_5lv ? 0xff00000000000000 : 0xffff800000000000;
struct gdtr *local_gdt = ext_mem_alloc(sizeof(struct gdtr));
local_gdt->limit = gdt.limit;
uint64_t local_gdt_base = (uint64_t)gdt.ptr;
if (stivale_hdr.flags & (1 << 3)) {
local_gdt_base += direct_map_offset;
}
local_gdt->ptr = local_gdt_base;
#if bios == 1
local_gdt->ptr_hi = local_gdt_base >> 32;
#endif
if (stivale_hdr.entry_point != 0)
entry_point = stivale_hdr.entry_point;
@ -356,7 +367,7 @@ bool stivale_load(char *config, char *cmdline) {
stivale_spinup(bits, want_5lv, &pagemap,
entry_point, REPORTED_ADDR((uint64_t)(uintptr_t)stivale_struct),
stivale_hdr.stack, false);
stivale_hdr.stack, false, (uintptr_t)local_gdt);
__builtin_unreachable();
@ -454,12 +465,12 @@ __attribute__((noreturn)) void stivale_spinup_32(
int bits, bool level5pg, uint32_t pagemap_top_lv,
uint32_t entry_point_lo, uint32_t entry_point_hi,
uint32_t stivale_struct_lo, uint32_t stivale_struct_hi,
uint32_t stack_lo, uint32_t stack_hi);
uint32_t stack_lo, uint32_t stack_hi, uint32_t local_gdt);
__attribute__((noreturn)) void stivale_spinup(
int bits, bool level5pg, pagemap_t *pagemap,
uint64_t entry_point, uint64_t _stivale_struct, uint64_t stack,
bool enable_nx) {
bool enable_nx, uint32_t local_gdt) {
#if bios == 1
if (bits == 64) {
// If we're going 64, we might as well call this BIOS interrupt
@ -481,9 +492,9 @@ __attribute__((noreturn)) void stivale_spinup(
irq_flush_type = IRQ_PIC_APIC_FLUSH;
common_spinup(stivale_spinup_32, 10,
common_spinup(stivale_spinup_32, 11,
bits, level5pg, enable_nx, (uint32_t)(uintptr_t)pagemap->top_level,
(uint32_t)entry_point, (uint32_t)(entry_point >> 32),
(uint32_t)_stivale_struct, (uint32_t)(_stivale_struct >> 32),
(uint32_t)stack, (uint32_t)(stack >> 32));
(uint32_t)stack, (uint32_t)(stack >> 32), local_gdt);
}

2
stage23/protos/stivale.h
View File

@ -16,6 +16,6 @@ pagemap_t stivale_build_pagemap(bool level5pg, bool unmap_null, struct elf_range
__attribute__((noreturn)) void stivale_spinup(
int bits, bool level5pg, pagemap_t *pagemap,
uint64_t entry_point, uint64_t stivale_struct, uint64_t stack,
bool enable_nx);
bool enable_nx, uint32_t local_gdt);
#endif

14
stage23/protos/stivale2.c
View File

@ -15,6 +15,7 @@
#include <lib/uri.h>
#include <sys/smp.h>
#include <sys/cpu.h>
#include <sys/gdt.h>
#include <lib/fb.h>
#include <lib/term.h>
#include <sys/pic.h>
@ -246,6 +247,17 @@ failed_to_load_header_section:
}
}
struct gdtr *local_gdt = ext_mem_alloc(sizeof(struct gdtr));
local_gdt->limit = gdt.limit;
uint64_t local_gdt_base = (uint64_t)gdt.ptr;
if (stivale2_hdr.flags & (1 << 1)) {
local_gdt_base += direct_map_offset;
}
local_gdt->ptr = local_gdt_base;
#if bios == 1
local_gdt->ptr_hi = local_gdt_base >> 32;
#endif
if (stivale2_hdr.entry_point != 0)
entry_point = stivale2_hdr.entry_point;
@ -807,7 +819,7 @@ have_tm_tag:;
stivale_spinup(bits, want_5lv, &pagemap, entry_point,
REPORTED_ADDR((uint64_t)(uintptr_t)stivale2_struct),
stivale2_hdr.stack, want_pmrs);
stivale2_hdr.stack, want_pmrs, (uintptr_t)local_gdt);
__builtin_unreachable();

2
stage23/sys/gdt.h
View File

@ -9,7 +9,7 @@ struct gdtr {
uint64_t ptr;
#elif defined (__i386__)
uint32_t ptr;
uint32_t pad;
uint32_t ptr_hi;
#endif
} __attribute__((packed));