Virtualization/qboot
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copy only ~11K down to low memory

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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini
2016-09-06 15:44:17 +02:00
parent 5ea29a8e87
commit f4569f4b68
4 changed files with 12 additions and 6 deletions
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2
flat.lds
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@ -14,12 +14,14 @@ SECTIONS
. = ALIGN(16);
edata = .;
. = 1024K - 128;
sinit = .;
.init : {
*(.init);
. = 128 - 16;
*(.resetvector);
. = 128;
}
einit = .;
}
ENTRY(main)

7
hwsetup.c
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@ -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();
}

5
include/bios.h
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@ -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)

4
malloc.c
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@ -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)