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FABRIC-3.10.8 MC-1b: aarch64's second core online and parked

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Cores from the DTB /cpus or, on QEMU (ACPI, no DTB), the MADT GICC
entries; the MADT lookup is now shared (hal/acpi.c) with amd64. PSCI
CPU_ON through the discovered conduit into ap_entry.S, which copies the
boot core's MMU/control state, sets TPIDR_EL1 and parks. Core 1 online
at EL1 with its own block; its vCPU thread 0.0% on the host. QEMU aarch64
-smp 2 -name debug-threads=on. 3-ISA acceptance clean.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Robert Allan James
2026-09-26 13:16:33 -04:00
co-authored by Claude Opus 5.5
parent 24bde47481
commit 3a2ba5149f
16 changed files with 27949 additions and 48 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/starkernel/arch/amd64/smp.c
+9 -44
View File
@@ -27,6 +27,7 @@
#include "starkernel/apic.h"
#include "starkernel/timer.h"
#include "starkernel/console.h"
#include "starkernel/acpi.h" /* MC-1b: the MADT lookup, shared with aarch64 */
#include "uefi.h"
extern char sk_ap_tramp_start[], sk_ap_tramp_end[];
@@ -49,48 +50,6 @@ typedef struct __attribute__((packed)) {
/* ---- MADT ---------------------------------------------------------------- */
typedef struct __attribute__((packed)) {
uint8_t signature[8];
uint8_t checksum;
uint8_t oem_id[6];
uint8_t revision;
uint32_t rsdt_address;
uint32_t length;
uint64_t xsdt_address;
} smp_rsdp_t;
typedef struct __attribute__((packed)) {
uint8_t signature[4];
uint32_t length;
uint8_t rest[28];
} smp_sdt_t;
static int sig_eq(const uint8_t *p, const char *s, int n)
{
int i;
for (i = 0; i < n; i++) if (p[i] != (uint8_t)s[i]) return 0;
return 1;
}
static const uint8_t *find_madt(void *rsdp_ptr)
{
const smp_rsdp_t *r = (const smp_rsdp_t *)rsdp_ptr;
const smp_sdt_t *xsdt;
const uint64_t *ent;
uint32_t n, i;
if (!r || !sig_eq(r->signature, "RSD PTR ", 8) || r->revision < 2 || !r->xsdt_address) return 0;
xsdt = (const smp_sdt_t *)(uintptr_t)r->xsdt_address;
if (!sig_eq(xsdt->signature, "XSDT", 4) || xsdt->length <= 36u) return 0;
n = (xsdt->length - 36u) / 8u;
ent = (const uint64_t *)((const uint8_t *)xsdt + 36u);
for (i = 0; i < n; i++) {
const smp_sdt_t *sdt = (const smp_sdt_t *)(uintptr_t)ent[i];
if (sdt && sig_eq(sdt->signature, "APIC", 4)) return (const uint8_t *)sdt;
}
return 0;
}
static int id_seen(const uint64_t *ids, uint32_t n, uint64_t id)
{
uint32_t i;
@@ -102,7 +61,7 @@ static int id_seen(const uint64_t *ids, uint32_t n, uint64_t id)
* id fits xAPIC (<= 255) and was not already listed. */
uint32_t arch_smp_enumerate(BootInfo *boot_info, uint64_t *hw_ids, uint32_t cap)
{
const uint8_t *madt = find_madt(boot_info ? boot_info->acpi_table : (void *)0);
const uint8_t *madt = acpi_find_table(boot_info ? boot_info->acpi_table : (void *)0, "APIC");
const uint8_t *p, *end;
uint32_t n = 0, pass;
@@ -110,7 +69,7 @@ uint32_t arch_smp_enumerate(BootInfo *boot_info, uint64_t *hw_ids, uint32_t cap)
if (cap) hw_ids[0] = apic_id();
return 1;
}
end = madt + ((const smp_sdt_t *)madt)->length;
end = madt + acpi_table_length(madt);
for (pass = 0; pass < 2; pass++) {
for (p = madt + 44; p + 2 <= end; p += p[1]) {
uint64_t id;
@@ -148,6 +107,12 @@ void arch_smp_park_once(void)
__asm__ volatile ("cli; hlt" ::: "memory");
}
const char *arch_smp_arrival(const sk_percpu_t *pc)
{
(void)pc;
return "long mode"; /* the trampoline's only way to reach C */
}
/* ---- the trampoline page ------------------------------------------------- */
static uint64_t g_tramp_page; /* 0 = not chosen yet */