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qemu: load e820 from fw_cfg 

qemu 1.7+ provides a fw_cfg file named "etc/e820" with e820-like entries
for reservations and ram regions.  Use it for ram detection if present,
otherwise fallback to the traditional cmos method.

Change-Id: Icac6c99d2a053e59dfdd28e48d1ceb3d56a61bdc
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-on: http://review.coreboot.org/4030
Tested-by: build bot (Jenkins)
This commit is contained in:
Gerd Hoffmann 2013-11-06 14:36:17 +01:00
parent 289b45fdff
commit baa782020e
2 changed files with 59 additions and 10 deletions
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6
src/mainboard/emulation/qemu-i440fx/fw_cfg_if.h
View File

@ -51,3 +51,9 @@ typedef struct FWCfgFiles {
uint32_t count;
FWCfgFile f[];
} FWCfgFiles;
typedef struct FwCfgE820Entry {
uint64_t address;
uint64_t length;
uint32_t type;
} FwCfgE820Entry __attribute((__aligned__(4)));

49
src/mainboard/emulation/qemu-i440fx/northbridge.c
View File

@ -13,6 +13,7 @@
#include <cbmem.h>
#include "fw_cfg.h"
#include "fw_cfg_if.h"
#include "memory.c"
@ -58,20 +59,62 @@ static void cpu_pci_domain_read_resources(struct device *dev)
struct resource *res;
unsigned long tomk = 0, high;
int idx = 10;
int size;
pci_domain_read_resources(dev);
size = fw_cfg_check_file("etc/e820");
if (size > 0) {
/* supported by qemu 1.7+ */
FwCfgE820Entry *list = malloc(size);
int i;
fw_cfg_load_file("etc/e820", list);
for (i = 0; i < size/sizeof(*list); i++) {
switch (list[i].type) {
case 1: /* ram */
printk(BIOS_DEBUG, "QEMU: e820/ram: 0x%08llx +0x%08llx\n",
list[i].address, list[i].length);
if (list[i].address == 0) {
tomk = list[i].length / 1024;
ram_resource(dev, idx++, 0, 640);
ram_resource(dev, idx++, 768, tomk - 768);
} else {
ram_resource(dev, idx++,
list[i].address / 1024,
list[i].length / 1024);
}
break;
case 2: /* reserved */
printk(BIOS_DEBUG, "QEMU: e820/res: 0x%08llx +0x%08llx\n",
list[i].address, list[i].length);
res = new_resource(dev, idx++);
res->base = list[i].address;
res->size = list[i].length;
res->limit = 0xffffffff;
res->flags = IORESOURCE_MEM | IORESOURCE_FIXED |
IORESOURCE_STORED | IORESOURCE_ASSIGNED;
break;
default:
/* skip unknown */
break;
}
}
free(list);
}
if (!tomk) {
/* qemu older than 1.7, or reading etc/e820 failed. Fallback to cmos. */
tomk = qemu_get_memory_size();
high = qemu_get_high_memory_size();
printk(BIOS_DEBUG, "Detected %lu MiB RAM below 4G.\n", tomk / 1024);
printk(BIOS_DEBUG, "Detected %lu MiB RAM above 4G.\n", high / 1024);
printk(BIOS_DEBUG, "QEMU: cmos: %lu MiB RAM below 4G.\n", tomk / 1024);
printk(BIOS_DEBUG, "QEMU: cmos: %lu MiB RAM above 4G.\n", high / 1024);
/* Report the memory regions. */
idx = 10;
ram_resource(dev, idx++, 0, 640);
ram_resource(dev, idx++, 768, tomk - 768);
if (high)
ram_resource(dev, idx++, 4 * 1024 * 1024, high);
}
/* Reserve I/O ports used by QEMU */
qemu_reserve_ports(dev, idx++, 0x0510, 0x02, "firmware-config");