Commit fb7c2bae authored by David Daney's avatar David Daney Committed by Rafael J. Wysocki

ACPI / processor: Add acpi_map_madt_entry()

Follow-on arm64 ACPI/NUMA patches need to map MADT entries very early
(before kmalloc is usable).

Add acpi_map_madt_entry() which, indirectly, uses
early_memremap()/early_memunmap() to access the table and parse out
the mpidr.  The existing implementation of map_madt_entry() is
modified to take a pointer to the MADT as a parameter and the callers
Signed-off-by: default avatarDavid Daney <>
Acked-by: default avatarCatalin Marinas <>
Signed-off-by: default avatarRafael J. Wysocki <>
parent e0af261a
......@@ -108,13 +108,12 @@ static int map_gicc_mpidr(struct acpi_subtable_header *entry,
return -EINVAL;
static phys_cpuid_t map_madt_entry(int type, u32 acpi_id)
static phys_cpuid_t map_madt_entry(struct acpi_table_madt *madt,
int type, u32 acpi_id)
unsigned long madt_end, entry;
phys_cpuid_t phys_id = PHYS_CPUID_INVALID; /* CPU hardware ID */
struct acpi_table_madt *madt;
madt = get_madt_table();
if (!madt)
return phys_id;
......@@ -145,6 +144,25 @@ static phys_cpuid_t map_madt_entry(int type, u32 acpi_id)
return phys_id;
phys_cpuid_t __init acpi_map_madt_entry(u32 acpi_id)
struct acpi_table_madt *madt = NULL;
acpi_size tbl_size;
phys_cpuid_t rv;
acpi_get_table_with_size(ACPI_SIG_MADT, 0,
(struct acpi_table_header **)&madt,
if (!madt)
rv = map_madt_entry(madt, 1, acpi_id);
early_acpi_os_unmap_memory(madt, tbl_size);
return rv;
static phys_cpuid_t map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
......@@ -185,7 +203,7 @@ phys_cpuid_t acpi_get_phys_id(acpi_handle handle, int type, u32 acpi_id)
phys_id = map_mat_entry(handle, type, acpi_id);
if (invalid_phys_cpuid(phys_id))
phys_id = map_madt_entry(type, acpi_id);
phys_id = map_madt_entry(get_madt_table(), type, acpi_id);
return phys_id;
......@@ -309,6 +309,7 @@ static inline int acpi_processor_get_bios_limit(int cpu, unsigned int *limit)
/* in processor_core.c */
phys_cpuid_t acpi_get_phys_id(acpi_handle, int type, u32 acpi_id);
phys_cpuid_t acpi_map_madt_entry(u32 acpi_id);
int acpi_map_cpuid(phys_cpuid_t phys_id, u32 acpi_id);
int acpi_get_cpuid(acpi_handle, int type, u32 acpi_id);
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