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acpi: build_append_nameseg(): add padding if necessary

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According to ACPI spec NameSeg shorter than 4 characters
must be padded up to 4 characters with "_" symbol.
ACPI 5.0:  20.2.2 "Name Objects Encoding"

Do it in build_append_nameseg() so that caller shouldn't know
or care about it.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Claudio Fontana <claudio.fontana@huawei.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Igor Mammedov 2014-12-19 11:47:00 +00:00 committed by Michael S. Tsirkin
parent e909c16d92
commit 6d848641b7
1 changed files with 10 additions and 5 deletions
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15
hw/i386/acpi-build.c
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@ -305,6 +305,8 @@ static inline void build_append_array(GArray *array, GArray *val)
g_array_append_vals(array, val->data, val->len);
}
#define ACPI_NAMESEG_LEN 4
static void GCC_FMT_ATTR(2, 3)
build_append_nameseg(GArray *array, const char *format, ...)
{
@ -317,8 +319,11 @@ build_append_nameseg(GArray *array, const char *format, ...)
len = vsnprintf(s, sizeof s, format, args);
va_end(args);
assert(len == 4);
assert(len <= ACPI_NAMESEG_LEN);
g_array_append_vals(array, s, len);
/* Pad up to ACPI_NAMESEG_LEN characters if necessary. */
g_array_append_vals(array, "____", ACPI_NAMESEG_LEN - len);
}
/* 5.4 Definition Block Encoding */
@ -859,7 +864,7 @@ static void build_pci_bus_end(PCIBus *bus, void *bus_state)
if (bus->parent_dev) {
op = 0x82; /* DeviceOp */
build_append_nameseg(bus_table, "S%.02X_",
build_append_nameseg(bus_table, "S%.02X",
bus->parent_dev->devfn);
build_append_byte(bus_table, 0x08); /* NameOp */
build_append_nameseg(bus_table, "_SUN");
@ -979,7 +984,7 @@ static void build_pci_bus_end(PCIBus *bus, void *bus_state)
build_append_int(notify, 0x1U << i);
build_append_byte(notify, 0x00); /* NullName */
build_append_byte(notify, 0x86); /* NotifyOp */
build_append_nameseg(notify, "S%.02X_", PCI_DEVFN(i, 0));
build_append_nameseg(notify, "S%.02X", PCI_DEVFN(i, 0));
build_append_byte(notify, 0x69); /* Arg1Op */
/* Pack it up */
@ -1036,7 +1041,7 @@ static void build_pci_bus_end(PCIBus *bus, void *bus_state)
if (bus->parent_dev) {
build_append_byte(parent->notify_table, '^'); /* ParentPrefixChar */
build_append_byte(parent->notify_table, 0x2E); /* DualNamePrefix */
build_append_nameseg(parent->notify_table, "S%.02X_",
build_append_nameseg(parent->notify_table, "S%.02X",
bus->parent_dev->devfn);
build_append_nameseg(parent->notify_table, "PCNT");
}
@ -1106,7 +1111,7 @@ build_ssdt(GArray *table_data, GArray *linker,
GArray *sb_scope = build_alloc_array();
uint8_t op = 0x10; /* ScopeOp */
build_append_nameseg(sb_scope, "_SB_");
build_append_nameseg(sb_scope, "_SB");
/* build Processor object for each processor */
for (i = 0; i < acpi_cpus; i++) {