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Diffstat (limited to 'src/cpu/x86/64bit/pt1G.S')
| -rw-r--r-- | src/cpu/x86/64bit/pt1G.S | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/src/cpu/x86/64bit/pt1G.S b/src/cpu/x86/64bit/pt1G.S new file mode 100644 index 0000000000..3ddb620eaa --- /dev/null +++ b/src/cpu/x86/64bit/pt1G.S @@ -0,0 +1,29 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +/* + * For reference see "AMD64 Architecture Programmer's Manual Volume 2", + * Document 24593-Rev. 3.31-July 2019 Chapter 5.3.4 + * + * Page table attributes: WB, User+Supervisor, Present, Writeable, Accessed, Dirty + */ + +.section .rodata +#define _PRES (1ULL << 0) +#define _RW (1ULL << 1) +#define _US (1ULL << 2) +#define _A (1ULL << 5) +#define _D (1ULL << 6) +#define _PS (1ULL << 7) +#define _GEN_DIR(a) (_PRES + _RW + _US + _A + (a)) +#define _GEN_PAGE(a) (_PRES + _RW + _US + _PS + _A + _D + (a)) + +.global PM4LE +.align 4096 +PM4LE: +.quad _GEN_DIR(PDE_table) + +.align 4096 +PDE_table: /* identity map 1GiB pages * 512 */ +.rept 512 +.quad _GEN_PAGE(0x40000000 * ((. - PDE_table) >> 3)) +.endr |