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Qemu, despite "emulating" an intel chipset, uses the CMOS to 

tell the BIOS how much RAM the virtual machine has available.
This patch fixes the detection.

Signed-off-by: Valdimir Serbinenko <phcoder@gmail.com>
Acked-by: Stefan Reinauer <stepan@coresystems.de>



git-svn-id: svn://svn.coreboot.org/coreboot/trunk@5521 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
This commit is contained in:
Valdimir Serbinenko 2010-05-03 16:21:52 +00:00 committed by Stefan Reinauer
parent 80d9804ff7
commit 7339f36961
1 changed files with 30 additions and 46 deletions
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50
src/mainboard/emulation/qemu-x86/northbridge.c
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@ -53,42 +53,26 @@ static uint32_t find_pci_tolm(struct bus *bus)
extern uint64_t high_tables_base, high_tables_size;
#endif
#define CMOS_ADDR_PORT 0x70
#define CMOS_DATA_PORT 0x71
#define HIGH_RAM_ADDR 0x35
#define LOW_RAM_ADDR 0x34
static void cpu_pci_domain_set_resources(device_t dev)
{
static const uint8_t ramregs[] = {
0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, 0x56, 0x57
};
device_t mc_dev;
uint32_t pci_tolm;
u32 pci_tolm = find_pci_tolm(&dev->link[0]);
unsigned long tomk = 0, tolmk;
int idx;
pci_tolm = find_pci_tolm(&dev->link[0]);
mc_dev = dev->link[0].children;
if (mc_dev) {
unsigned long tomk, tolmk;
unsigned char rambits;
int i, idx;
outb (HIGH_RAM_ADDR, CMOS_ADDR_PORT);
tomk = ((unsigned long) inb(CMOS_DATA_PORT)) << 14;
outb (LOW_RAM_ADDR, CMOS_ADDR_PORT);
tomk |= ((unsigned long) inb(CMOS_DATA_PORT)) << 6;
tomk += 16 * 1024;
printk(BIOS_DEBUG, "Detected %lu Kbytes (%lu MiB) RAM.\n",
tomk, tomk / 1024);
for(rambits = 0, i = 0; i < ARRAY_SIZE(ramregs); i++) {
unsigned char reg;
reg = pci_read_config8(mc_dev, ramregs[i]);
/* these are ENDING addresses, not sizes.
* if there is memory in this slot, then reg will be > rambits.
* So we just take the max, that gives us total.
* We take the highest one to cover for once and future coreboot
* bugs. We warn about bugs.
*/
if (reg > rambits)
rambits = reg;
if (reg < rambits)
printk(BIOS_ERR, "ERROR! register 0x%x is not set!\n",
ramregs[i]);
}
if (rambits == 0) {
printk(BIOS_ERR, "RAM size config registers are empty; defaulting to 64 MBytes\n");
rambits = 8;
}
printk(BIOS_DEBUG, "I would set ram size to 0x%x Kbytes\n", (rambits)*8*1024);
tomk = rambits*8*1024;
/* Compute the top of Low memory */
tolmk = pci_tolm >> 10;
if (tolmk >= tomk) {
@ -106,7 +90,7 @@ static void cpu_pci_domain_set_resources(device_t dev)
high_tables_base = (tomk - HIGH_TABLES_SIZE) * 1024;
high_tables_size = HIGH_TABLES_SIZE * 1024;
#endif
}
assign_resources(&dev->link[0]);
}