[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v3 25/62] acpi/table: Introduce acpi_get_entry to get specified entry
From: Shannon Zhao <shannon.zhao@xxxxxxxxxx> When constructing MADT table for Dom0, it needs to create GICC subtable according to the dom0_max_vcpus. This function could be used for get the specified entry. Signed-off-by: Shannon Zhao <shannon.zhao@xxxxxxxxxx> --- xen/drivers/acpi/tables.c | 45 +++++++++++++++++++++++++++++++++++++++++++++ xen/include/xen/acpi.h | 4 ++++ 2 files changed, 49 insertions(+) diff --git a/xen/drivers/acpi/tables.c b/xen/drivers/acpi/tables.c index 2fba206..3ba8bad 100644 --- a/xen/drivers/acpi/tables.c +++ b/xen/drivers/acpi/tables.c @@ -221,6 +221,51 @@ void __init acpi_table_print_madt_entry(struct acpi_subtable_header *header) } } +struct acpi_subtable_header * __init +acpi_get_entry(char *id, unsigned long table_size, + struct acpi_table_header *table_header, int entry_id, + unsigned int entry_index) +{ + struct acpi_subtable_header *entry; + unsigned int count = 0; + unsigned long table_end; + + if ( !table_size ) + return NULL; + + if ( !table_header ) + { + printk("Table header not present\n"); + return NULL; + } + + table_end = (unsigned long)table_header + table_header->length; + + /* Parse all entries looking for a match. */ + entry = (struct acpi_subtable_header *) + ((unsigned long)table_header + table_size); + + while (((unsigned long)entry) + sizeof(struct acpi_subtable_header) < + table_end) { + if (entry->length < sizeof(*entry)) { + printk(KERN_ERR PREFIX "[%4.4s:%#x] Invalid length\n", + id, entry_id); + return NULL; + } + + if (entry->type == entry_id) { + if (count == entry_index) + return entry; + count++; + } + + entry = (struct acpi_subtable_header *) + ((unsigned long)entry + entry->length); + } + + return NULL; +} + int __init acpi_parse_entries(char *id, unsigned long table_size, diff --git a/xen/include/xen/acpi.h b/xen/include/xen/acpi.h index 23f8261..3339374 100644 --- a/xen/include/xen/acpi.h +++ b/xen/include/xen/acpi.h @@ -72,6 +72,10 @@ int acpi_table_init (void); int acpi_table_parse(char *id, acpi_table_handler handler); int acpi_table_parse_entries(char *id, unsigned long table_size, int entry_id, acpi_table_entry_handler handler, unsigned int max_entries); +struct acpi_subtable_header * +acpi_get_entry(char *id, unsigned long table_size, + struct acpi_table_header *table_header, int entry_id, + unsigned int entry_index); int acpi_parse_entries(char *id, unsigned long table_size, acpi_table_entry_handler handler, struct acpi_table_header *table_header, int entry_id, unsigned int max_entries); -- 2.1.0 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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