diff options
Diffstat (limited to 'src/northbridge')
| -rw-r--r-- | src/northbridge/intel/haswell/northbridge.c | 26 |
1 files changed, 24 insertions, 2 deletions
diff --git a/src/northbridge/intel/haswell/northbridge.c b/src/northbridge/intel/haswell/northbridge.c index 0d611fc105..90c47a7844 100644 --- a/src/northbridge/intel/haswell/northbridge.c +++ b/src/northbridge/intel/haswell/northbridge.c @@ -340,7 +340,8 @@ static void mc_add_dram_resources(device_t dev) * cacheable and reserved * - SMM_DEFAULT_BASE + SMM_DEFAULT_SIZE -> 0xa0000 : cacheable * - 0xc0000 -> TSEG : cacheable - * - TESG -> TOLUD: not cacheable with standard MTRRs and reserved + * - TESG -> BGSM: cacheable with standard MTRRs and reserved + * - BGSM -> TOLUD: not cacheable with standard MTRRs and reserved * - 4GiB -> TOUUD: cacheable * * The default SMRAM space is reserved so that the range doesn't @@ -354,6 +355,10 @@ static void mc_add_dram_resources(device_t dev) * is not omitted the mtrr code will setup the area as cacheable * causing VGA access to not work. * + * The TSEG region is mapped as cacheable so that one can perform + * SMRAM relocation faster. Once the SMRR is enabled the SMRR takes + * precedence over the existing MTRRs covering this region. + * * It should be noted that cacheable entry types need to be added in * order. The reason is that the current MTRR code assumes this and * falls over itself if it isn't. @@ -386,9 +391,17 @@ static void mc_add_dram_resources(device_t dev) size_k = (unsigned long)(mc_values[TSEG_REG] >> 10) - base_k; ram_resource(dev, index++, base_k, size_k); - /* TSEG -> TOLUD */ + /* TSEG -> BGSM */ resource = new_resource(dev, index++); resource->base = mc_values[TSEG_REG]; + resource->size = mc_values[BGSM_REG] - resource->base; + resource->flags = IORESOURCE_MEM | IORESOURCE_FIXED | + IORESOURCE_STORED | IORESOURCE_RESERVE | + IORESOURCE_ASSIGNED | IORESOURCE_CACHEABLE; + + /* BGSM -> TOLUD */ + resource = new_resource(dev, index++); + resource->base = mc_values[BGSM_REG]; resource->size = mc_values[TOLUD_REG] - resource->base; resource->flags = IORESOURCE_MEM | IORESOURCE_FIXED | IORESOURCE_STORED | IORESOURCE_RESERVE | @@ -581,6 +594,15 @@ static const struct pci_driver mc_driver_hsw_ult __pci_driver = { static void cpu_bus_init(device_t dev) { + /* + * This calls into the gerneic initialize_cpus() which attempts to + * start APs on the APIC bus in the devicetree. No APs get started + * because there is only the BSP and placeholder (disabled) in the + * devicetree. initialize_cpus() also does SMM initialization by way + * of smm_init(). It will eventually call cpu_initialize(0) which calls + * dev_ops->init(). For Haswell the dev_ops->init() starts up the APs + * by way of intel_cores_init(). + */ initialize_cpus(dev->link_list); } |