diff options
author | Paolo Bonzini <pbonzini@redhat.com> | 2016-09-06 15:44:17 +0200 |
---|---|---|
committer | Paolo Bonzini <pbonzini@redhat.com> | 2016-09-06 16:19:54 +0200 |
commit | f4569f4b687e4302e96764aba2c756513b79e2e0 (patch) | |
tree | 50282a20130d060f4a8c688e807a84eab97de11b | |
parent | 5ea29a8e87a24ac9e2b1ab4f05094102af6a3c9d (diff) | |
download | qboot-f4569f4b687e4302e96764aba2c756513b79e2e0.zip qboot-f4569f4b687e4302e96764aba2c756513b79e2e0.tar.gz qboot-f4569f4b687e4302e96764aba2c756513b79e2e0.tar.bz2 |
copy only ~11K down to low memory
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
-rw-r--r-- | flat.lds | 2 | ||||
-rw-r--r-- | hwsetup.c | 7 | ||||
-rw-r--r-- | include/bios.h | 5 | ||||
-rw-r--r-- | malloc.c | 4 |
4 files changed, 12 insertions, 6 deletions
@@ -14,12 +14,14 @@ SECTIONS . = ALIGN(16); edata = .; . = 1024K - 128; + sinit = .; .init : { *(.init); . = 128 - 16; *(.resetvector); . = 128; } + einit = .; } ENTRY(main) @@ -85,8 +85,8 @@ static void setup_pic(void) void setup_hw(void) { const int bdf = 0; - const uint8_t *bios_start = (uint8_t *)0xffff0000; - uint8_t *low_start = (uint8_t *)0xf0000; + const uint8_t *bios_start = &stext + 0xfff00000; + const uint8_t *init_start = &sinit + 0xfff00000; int pambase; uint32_t id = pci_config_readl(bdf, 0); @@ -111,7 +111,8 @@ void setup_hw(void) // Make ram from 0xf0000-0x100000 read-write and shadow BIOS // We're still running from 0xffff0000 pci_config_writeb(bdf, pambase, 0x30); - memcpy(low_start, bios_start, 0x10000); + memcpy(&stext, bios_start, &edata - &stext); + memcpy(&sinit, init_start, &einit - &sinit); setup_pic(); } diff --git a/include/bios.h b/include/bios.h index eddca6b..bc96f87 100644 --- a/include/bios.h +++ b/include/bios.h @@ -47,6 +47,11 @@ extern bool boot_from_cbfs(void *base, size_t sz); extern uint16_t e820_seg; extern uint32_t lowmem; +extern uint8_t stext; +extern uint8_t edata; +extern uint8_t sinit; +extern uint8_t einit; + #define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0])) static inline void __attribute__((noreturn)) panic(void) @@ -1,10 +1,8 @@ #include <inttypes.h> #include "string.h" +#include "bios.h" -extern uint8_t edata; static uint8_t *fseg_base = &edata; - -extern uint8_t stext; static uint8_t *malloc_top = &stext; void *malloc(int n) |