From ec5f92ce6ac8ec09056be77e03c941be188648fa Mon Sep 17 00:00:00 2001 From: "Bernhard M. Wiedemann" Date: Tue, 20 Apr 2010 20:48:06 +0200 Subject: [PATCH] hw: better i440 emulation 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 Signed-off-by: Anthony Liguori --- hw/pc.c | 2 +- hw/pc.h | 2 +- hw/piix_pci.c | 7 ++++++- 3 files changed, 8 insertions(+), 3 deletions(-) diff --git a/hw/pc.c b/hw/pc.c index b659344154..db2b9a25b8 100644 --- a/hw/pc.c +++ b/hw/pc.c @@ -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); diff --git a/hw/pc.h b/hw/pc.h index 5f86b37fb2..d11a576be0 100644 --- a/hw/pc.h +++ b/hw/pc.h @@ -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); diff --git a/hw/piix_pci.c b/hw/piix_pci.c index cd12212fff..97519dbb5f 100644 --- a/hw/piix_pci.c +++ b/hw/piix_pci.c @@ -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; } -- 2.42.0