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fix for qemu northbridge, from Ed Swierk 

Signed-off-by: Ronald G. Minnich


git-svn-id: svn://svn.coreboot.org/coreboot/trunk@2405 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
This commit is contained in:
Ronald G. Minnich 2006-09-13 04:12:35 +00:00 committed by Ronald G. Minnich
parent aefa3d74f9
commit 9cf642bad3
1 changed files with 28 additions and 9 deletions
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37
src/cpu/emulation/qemu-i386/northbridge.c
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@ -67,16 +67,40 @@ static uint32_t find_pci_tolm(struct bus *bus)
static void 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;
uint32_t idx;
pci_tolm = find_pci_tolm(&dev->link[0]);
mc_dev = dev->link[0].children;
if (mc_dev) {
unsigned long tomk, tolmk;
/* Hard code the Top of memory for now */
tomk = 65536;
unsigned char rambits;
int i, idx;
for(rambits = 0, i = 0; i < sizeof(ramregs)/sizeof(ramregs[0]); 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 linuxbios
* bugs. We warn about bugs.
*/
if (reg > rambits)
rambits = reg;
if (reg < rambits)
printk_err("ERROR! register 0x%x is not set!\n",
ramregs[i]);
}
if (rambits == 0) {
printk_err("RAM size config registers are empty; defaulting to 64 MBytes\n");
rambits = 8;
}
printk_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) {
@ -84,14 +108,9 @@ static void pci_domain_set_resources(device_t dev)
*/
tolmk = tomk;
}
/* Report the memory regions */
idx = 10;
ram_resource(dev, idx++, 0, 640);
ram_resource(dev, idx++, 768, tolmk - 768);
if (tomk > 4*1024*1024) {
ram_resource(dev, idx++, 4096*1024, tomk - 4*1024*1024);
}
ram_resource(dev, idx++, 0, tolmk);
}
assign_resources(&dev->link[0]);
}