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hw: better i440 emulation

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updated version of an old patch
http://xenon.stanford.edu/~eswierk/misc/qemu-linuxbios/qemu-piix-ram-size.patch
that together with
http://www.mail-archive.com/linuxbios@linuxbios.org/msg02390.html
(which is already in coreboot trunk) allows coreboot to autodetect the amount of RAM within qemu/kvm from a register in i440 northbridge.

The message on the old patch states:
Unfortunately the current version of qemu does not set these
registers, but I have patched qemu so that it emulates the i440 more
faithfully in this regard.

Signed-off-by: Bernhard M. Wiedemann <qemudevbmw@lsmod.de>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Bernhard M. Wiedemann 2010-04-20 20:48:06 +02:00 committed by Anthony Liguori
parent cb4e5f8ed1
commit ec5f92ce6a
3 changed files with 8 additions and 3 deletions
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2
hw/pc.c
View File

@ -924,7 +924,7 @@ static void pc_init1(ram_addr_t ram_size,
isa_irq = qemu_allocate_irqs(isa_irq_handler, isa_irq_state, 24);
if (pci_enabled) {
pci_bus = i440fx_init(&i440fx_state, &piix3_devfn, isa_irq);
pci_bus = i440fx_init(&i440fx_state, &piix3_devfn, isa_irq, ram_size);
} else {
pci_bus = NULL;
isa_bus_new(NULL);

2
hw/pc.h
View File

@ -107,7 +107,7 @@ int pcspk_audio_init(qemu_irq *pic);
struct PCII440FXState;
typedef struct PCII440FXState PCII440FXState;
PCIBus *i440fx_init(PCII440FXState **pi440fx_state, int *piix_devfn, qemu_irq *pic);
PCIBus *i440fx_init(PCII440FXState **pi440fx_state, int *piix_devfn, qemu_irq *pic, int ram_size);
void i440fx_set_smm(PCII440FXState *d, int val);
void i440fx_init_memory_mappings(PCII440FXState *d);

7
hw/piix_pci.c
View File

@ -213,7 +213,7 @@ static int i440fx_initfn(PCIDevice *dev)
return 0;
}
PCIBus *i440fx_init(PCII440FXState **pi440fx_state, int *piix3_devfn, qemu_irq *pic)
PCIBus *i440fx_init(PCII440FXState **pi440fx_state, int *piix3_devfn, qemu_irq *pic, int ram_size)
{
DeviceState *dev;
PCIBus *b;
@ -238,6 +238,11 @@ PCIBus *i440fx_init(PCII440FXState **pi440fx_state, int *piix3_devfn, qemu_irq *
*piix3_devfn = piix3->dev.devfn;
ram_size = ram_size / 8 / 1024 / 1024;
if (ram_size > 255)
ram_size = 255;
(*pi440fx_state)->dev.config[0x57]=ram_size;
return b;
}