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nb/intel/gm45: Rework nb resource reading 

- Use newer functions and avoid the * / KiB dance
- Use existing functions for figuring out TSEG and UMA

Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Change-Id: Ic6f42053b5303151906360d8512b9d63dd297854
Reviewed-on: https://review.coreboot.org/c/coreboot/+/76249
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-by: Martin L Roth <gaumless@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Arthur Heymans 2023-07-05 08:25:55 +02:00 committed by Martin L Roth
parent 5acb1a0d0c
commit f06e993a87
1 changed files with 24 additions and 46 deletions
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70
src/northbridge/intel/gm45/northbridge.c
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@ -9,6 +9,7 @@
#include <cpu/cpu.h>
#include <cpu/intel/speedstep.h>
#include <cpu/intel/smm_reloc.h>
#include <cpu/x86/smm.h>
#include <device/device.h>
#include <device/pci_def.h>
#include <device/pci_ops.h>
@ -27,7 +28,7 @@ static uint64_t get_touud(void)
static void mch_domain_read_resources(struct device *dev)
{
u64 tom, touud;
u32 tomk, tolud, uma_sizek = 0, delta_cbmem;
u32 tolud;
int idx = 3;
/* Total Memory 2GB example:
@ -67,44 +68,8 @@ static void mch_domain_read_resources(struct device *dev)
printk(BIOS_DEBUG, "TOUUD 0x%llx TOLUD 0x%08x TOM 0x%llx\n",
touud, tolud, tom);
tomk = tolud >> 10;
/* Graphics memory comes next */
const u16 ggc = pci_read_config16(mch, D0F0_GGC);
if (!(ggc & 2)) {
printk(BIOS_DEBUG, "IGD decoded, subtracting ");
/* Graphics memory */
const u32 gms_sizek = decode_igd_memory_size((ggc >> 4) & 0xf);
printk(BIOS_DEBUG, "%uM UMA, ", gms_sizek >> 10);
tomk -= gms_sizek;
/* GTT Graphics Stolen Memory Size (GGMS) */
const u32 gsm_sizek = decode_igd_gtt_size((ggc >> 8) & 0xf);
printk(BIOS_DEBUG, "%uM GTT", gsm_sizek >> 10);
tomk -= gsm_sizek;
uma_sizek = gms_sizek + gsm_sizek;
}
const u8 esmramc = pci_read_config8(mch, D0F0_ESMRAMC);
const u32 tseg_sizek = decode_tseg_size(esmramc);
printk(BIOS_DEBUG, " and %uM TSEG\n", tseg_sizek >> 10);
tomk -= tseg_sizek;
uma_sizek += tseg_sizek;
/* cbmem_top can be shifted downwards due to alignment.
Mark the region between cbmem_top and tomk as unusable */
delta_cbmem = tomk - ((uintptr_t)cbmem_top() >> 10);
tomk -= delta_cbmem;
uma_sizek += delta_cbmem;
printk(BIOS_DEBUG, "Unused RAM between cbmem_top and TOM: 0x%xK\n",
delta_cbmem);
printk(BIOS_INFO, "Available memory below 4GB: %uM\n", tomk >> 10);
/* Report lowest memory region */
ram_resource_kb(dev, idx++, 0, 0xa0000 / KiB);
ram_range(dev, idx++, 0, 0xa0000);
/*
* Reserve everything between A segment and 1MB:
@ -112,11 +77,29 @@ static void mch_domain_read_resources(struct device *dev)
* 0xa0000 - 0xbffff: Legacy VGA
* 0xc0000 - 0xfffff: RAM
*/
mmio_resource_kb(dev, idx++, 0xa0000 / KiB, (0xc0000 - 0xa0000) / KiB);
reserved_ram_resource_kb(dev, idx++, 0xc0000 / KiB, (1*MiB - 0xc0000) / KiB);
mmio_from_to(dev, idx++, 0xa0000, 0xc0000);
reserved_ram_from_to(dev, idx++, 0xc0000, 1*MiB);
/* Report < 4GB memory */
ram_resource_kb(dev, idx++, 1*MiB / KiB, tomk - 1*MiB / KiB);
ram_range(dev, idx++, 1*MiB, (uintptr_t)cbmem_top());
/* TSEG */
uintptr_t tseg_base;
size_t tseg_size;
smm_region(&tseg_base, &tseg_size);
mmio_range(dev, idx++, tseg_base, tseg_size);
/* cbmem_top can be shifted downwards due to alignment.
Mark the region between cbmem_top and tseg_base as unusable */
if ((uintptr_t)cbmem_top() < tseg_base) {
printk(BIOS_DEBUG, "Unused RAM between cbmem_top and TOM: 0x%lx\n",
tseg_base - (uintptr_t)cbmem_top());
mmio_from_to(dev, idx++, (uintptr_t)cbmem_top(), tseg_base);
}
/* graphic memory above TSEG */
if (tseg_base + tseg_size < tolud)
mmio_from_to(dev, idx++, tseg_base + tseg_size, tolud);
/*
* If >= 4GB installed then memory from TOLUD to 4GB
@ -124,11 +107,6 @@ static void mch_domain_read_resources(struct device *dev)
*/
upper_ram_end(dev, idx++, touud);
printk(BIOS_DEBUG, "Adding UMA memory area base=0x%llx "
"size=0x%llx\n", ((u64)tomk) << 10, ((u64)uma_sizek) << 10);
/* Don't use uma_resource_kb() as our UMA touches the PCI hole. */
fixed_mem_resource_kb(dev, idx++, tomk, uma_sizek, IORESOURCE_RESERVE);
mmconf_resource(dev, idx++);
}