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Add support for 64-bit local APIC addresses found in the MADT. 

This is untested, as I don't have any hardware that uses this option.
This commit is contained in:
Martin Whitaker 2022-02-27 17:11:43 +00:00
parent 631cd553aa
commit b3d350f454
1 changed files with 32 additions and 5 deletions
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37
system/smp.c
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@ -96,6 +96,11 @@
#define CPU_ENABLED 1
#define CPU_BOOTPROCESSOR 2
// MADT entry types
#define MADT_PROCESSOR 0
#define MADT_LAPIC_ADDR 5
// MADT processor flag values
#define MADT_PF_ENABLED 0x1
@ -204,6 +209,11 @@ typedef struct {
char creator_revision[4];
} rsdt_header_t;
typedef struct {
uint8_t type;
uint8_t length;
} madt_entry_header_t;
typedef struct {
uint8_t type;
uint8_t length;
@ -212,6 +222,13 @@ typedef struct {
uint32_t flags;
} madt_processor_entry_t;
typedef struct {
uint8_t type;
uint8_t length;
uint16_t reserved;
uint64_t lapic_addr;
} madt_lapic_addr_entry_t;
//------------------------------------------------------------------------------
// Private Variables
//------------------------------------------------------------------------------
@ -420,16 +437,16 @@ static bool parse_madt(uintptr_t addr)
return false;
}
apic = (volatile apic_register_t *)map_region(mpc->lapic_addr, APIC_REGS_SIZE, false);
if (apic == NULL) return false;
uintptr_t apic_addr = mpc->lapic_addr;
int found_cpus = 0;
uint8_t *tab_entry_ptr = (uint8_t *)mpc + sizeof(mp_config_table_header_t);
uint8_t *mpc_table_end = (uint8_t *)mpc + mpc->length;
while (tab_entry_ptr < mpc_table_end) {
madt_processor_entry_t *entry = (madt_processor_entry_t *)tab_entry_ptr;
if (entry->type == MP_PROCESSOR) {
madt_entry_header_t *entry_header = (madt_entry_header_t *)tab_entry_ptr;
if (entry_header->type == MADT_PROCESSOR) {
madt_processor_entry_t *entry = (madt_processor_entry_t *)tab_entry_ptr;
if (entry->flags & (MADT_PF_ENABLED|MADT_PF_ONLINE_CAPABLE)) {
if (num_available_cpus < MAX_CPUS) {
cpu_num_to_apic_id[found_cpus] = entry->apic_id;
@ -441,7 +458,17 @@ static bool parse_madt(uintptr_t addr)
found_cpus++;
}
}
tab_entry_ptr += entry->length;
if (entry_header->type == MADT_LAPIC_ADDR) {
madt_lapic_addr_entry_t *entry = (madt_lapic_addr_entry_t *)tab_entry_ptr;
apic_addr = (uintptr_t)entry->lapic_addr;
}
tab_entry_ptr += entry_header->length;
}
apic = (volatile apic_register_t *)map_region(apic_addr, APIC_REGS_SIZE, false);
if (apic == NULL) {
num_available_cpus = 1;
return false;
}
return true;
}