diff options
| author | Patrick Rudolph <siro@das-labor.org> | 2019-09-28 17:44:01 +0200 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2019-11-04 11:58:58 +0000 |
| commit | b1ef725f391b3864c5051c7e7290311c475cfcd3 (patch) | |
| tree | 0c79e4d7dce03eaeb64233075bde399498fb65b6 /src/arch | |
| parent | 6f7c955464783ba21cda1bcf4b5582b2af0be31e (diff) | |
cpu/qemu-x86: Add x86_64 bootblock support
Add support for x86_64 bootblock on qemu.
Introduce a new approach to long mode support. The previous patch set
generated page tables at runtime and placed them in heap. The new
approach places the page tables in memory mapped ROM.
Introduce a new tool called pgtblgen that creates x86 long mode compatible
page tables and writes those to a file. The file is included into the CBFS
and placed at a predefined offset.
Add assembly code to load the page tables, based on a Kconfig symbol and
enter long in bootblock.
The code can be easily ported to real hardware bootblock.
Tested on qemu q35.
Change-Id: Iec92c6cea464c97c18a0811e2e91bc22133ace42
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/35680
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Diffstat (limited to 'src/arch')
| -rw-r--r-- | src/arch/x86/Kconfig | 8 | ||||
| -rw-r--r-- | src/arch/x86/bootblock_crt0.S | 6 |
2 files changed, 14 insertions, 0 deletions
diff --git a/src/arch/x86/Kconfig b/src/arch/x86/Kconfig index 171b408da2..37b7d2daaa 100644 --- a/src/arch/x86/Kconfig +++ b/src/arch/x86/Kconfig @@ -66,6 +66,14 @@ config ARCH_RAMSTAGE_X86_64 bool default n +config ARCH_X86_64_PGTBL_LOC + hex "x86_64 page table location in CBFS" + depends on ARCH_BOOTBLOCK_X86_64 + default 0xfffea000 + help + The position where to place pagetables. Needs to be known at + compile time. Must not overlap other files in CBFS. + config USE_MARCH_586 def_bool n help diff --git a/src/arch/x86/bootblock_crt0.S b/src/arch/x86/bootblock_crt0.S index 3cb57e058c..9fcb5c4e4a 100644 --- a/src/arch/x86/bootblock_crt0.S +++ b/src/arch/x86/bootblock_crt0.S @@ -31,6 +31,12 @@ #include <cpu/x86/16bit/reset16.inc> #include <cpu/x86/32bit/entry32.inc> + /* BIST result in eax */ + mov %eax, %ebx + /* entry64.inc preserves ebx. */ +#include <cpu/x86/64bit/entry64.inc> + mov %ebx, %eax + #if CONFIG(BOOTBLOCK_DEBUG_SPINLOOP) /* Wait for a JTAG debugger to break in and set EBX non-zero */ |