/kernel/trunk/arch/amd64/include/mm/page.h |
---|
26,6 → 26,18 |
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
*/ |
/** Paging on AMD64 |
* |
* The space is divided in positive numbers - userspace and |
* negative numbers - kernel space. The 'negative' space starting |
* with 0xffff800000000000 and ending with 0xffffffff80000000 |
* (-2GB) is identically mapped physical memory. The area |
* (0xffffffff80000000 ... 0xffffffffffffffff is again identically |
* mapped first 2GB. |
* |
* ATTENTION - PA2KA(KA2PA(x)) != x if 'x' is in kernel |
*/ |
#ifndef __amd64_PAGE_H__ |
#define __amd64_PAGE_H__ |
42,11 → 54,32 |
#endif |
#ifndef __ASM__ |
# define KA2PA(x) (((__address) (x)) - 0xffffffff80000000) |
# define PA2KA(x) (((__address) (x)) + 0xffffffff80000000) |
static inline __address ka2pa(__address x) |
{ |
if (x > 0xffffffff80000000) |
return x - 0xffffffff80000000; |
else |
return x - 0xffff800000000000; |
} |
/* Linker symbol */ |
extern int ktext_start; |
extern int kdata_end; |
static inline __address pa2ka(__address x) |
{ |
if (x >= ka2pa((__address)(&kdata_end)) || \ |
x <= ka2pa((__address)&ktext_start)) |
return x + 0xffff800000000000; |
else |
return x + 0xffffffff80000000; |
} |
# define KA2PA(x) ka2pa((__address)x) |
# define PA2KA(x) pa2ka((__address)x) |
# define PA2KA_IDENT(x) (((__address) (x)) + 0xffff800000000000) |
# define PA2KA_CODE(x) (((__address) (x)) + 0xffffffff80000000) |
#else |
# define KA2PA(x) ((x) - 0xffffffff80000000) |
# define PA2KA(x) ((x) + 0xffffffff80000000) |
# define PA2KA_DATA(x) ((x) + 0xffff800000000000) |
#endif |
#define PTL0_ENTRIES_ARCH 512 |
/kernel/trunk/arch/amd64/include/mm/as.h |
---|
31,7 → 31,7 |
#include <arch/types.h> |
#define KERNEL_ADDRESS_SPACE_START_ARCH (__address) 0xffffffff80000000 |
#define KERNEL_ADDRESS_SPACE_START_ARCH (__address) 0xffff800000000000 |
#define KERNEL_ADDRESS_SPACE_END_ARCH (__address) 0xffffffffffffffff |
#define USER_ADDRESS_SPACE_START_ARCH (__address) 0x0000000000000000 |
#define USER_ADDRESS_SPACE_END_ARCH (__address) 0x00007fffffffffff |
/kernel/trunk/arch/amd64/src/boot/boot.S |
---|
174,7 → 174,8 |
xorq %rdx, %rdx |
movl 0(%esi), %edx # mods->mod_start |
addq $0xffffffff80000000, %rdx |
movq $0xffff800000000000, %r10 |
addq %r10, %rdx |
movq %rdx, 8(%rdi) |
xorq %rdx, %rdx |
303,8 → 304,10 |
.global ptl_0 |
ptl_0: |
.quad ptl_1 + (PTL_WRITABLE | PTL_PRESENT) |
.fill 510,8,0 |
.fill 255,8,0 |
.quad ptl_1 + (PTL_WRITABLE | PTL_PRESENT) |
.fill 254,8,0 |
.quad ptl_1 + (PTL_WRITABLE | PTL_PRESENT) |
.global bootstrap_gdtr |
bootstrap_gdtr: |
/kernel/trunk/arch/amd64/src/mm/page.c |
---|
39,6 → 39,7 |
#include <interrupt.h> |
#include <print.h> |
#include <panic.h> |
#include <align.h> |
/* Definitions for identity page mapper */ |
pte_t helper_ptl1[512] __attribute__((aligned (PAGE_SIZE))); |
70,11 → 71,11 |
SET_FRAME_ADDRESS_ARCH(ptl3, PTL3_INDEX_ARCH(page), (__address)KA2PA(tgt)); \ |
SET_FRAME_FLAGS_ARCH(ptl3, PTL3_INDEX_ARCH(page), PAGE_WRITE | PAGE_EXEC); \ |
} |
void page_arch_init(void) |
{ |
__address cur; |
int flags; |
int i; |
int identity_flags = PAGE_CACHEABLE | PAGE_EXEC | PAGE_GLOBAL; |
if (config.cpu_active == 1) { |
page_mapping_operations = &pt_mapping_operations; |
83,11 → 84,22 |
* PA2KA(identity) mapping for all frames. |
*/ |
for (cur = 0; cur < last_frame; cur += FRAME_SIZE) { |
flags = PAGE_CACHEABLE | PAGE_EXEC; |
if ((PA2KA(cur) >= config.base) && (PA2KA(cur) < config.base + config.kernel_size)) |
flags |= PAGE_GLOBAL; |
page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, flags); |
/* Standard identity mapping */ |
page_mapping_insert(AS_KERNEL, PA2KA_IDENT(cur), cur, identity_flags); |
} |
/* Upper kernel mapping |
* - from zero to top of kernel (include bottom addresses |
* because some are needed for init ) |
*/ |
for (cur = PA2KA_CODE(0); cur < config.base+config.kernel_size; cur += FRAME_SIZE) { |
page_mapping_insert(AS_KERNEL, cur, KA2PA(cur), identity_flags); |
} |
for (i=0; i < init.cnt; i++) { |
for (cur=init.tasks[i].addr;cur < init.tasks[i].size; cur += FRAME_SIZE) { |
page_mapping_insert(AS_KERNEL, PA2KA_CODE(KA2PA(cur)), KA2PA(cur), identity_flags); |
} |
} |
exc_register(14, "page_fault", (iroutine)page_fault); |
write_cr3((__address) AS_KERNEL->page_table); |
} |