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[Qemu-devel] [PATCH v2] ACPI: Fix AppleSMC _STA size
From: |
Gabriel L. Somlo |
Subject: |
[Qemu-devel] [PATCH v2] ACPI: Fix AppleSMC _STA size |
Date: |
Mon, 13 Jan 2014 15:27:13 -0500 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
Minimize the storage used for AppleSMC's _STA (8bit), relying on ASL
to implicitly convert it to the officially specified 32bit value.
Signed-off-by: Gabriel Somlo <address@hidden>
---
This applies incrementally on top of "Add DSDT node for AppleSMC" v.3
(accepted Dec. 25, 2013), and obsoletes everything I've sent out since :)
After some experimentation I realized ASL is flexible about the size of
its named variables, and happy to implicitly convert an 8bit value to
32 bits when needed. As such, I vote for the space saving option...
Thanks, and sorry for all the noise,
Gabriel
hw/i386/acpi-dsdt-isa.dsl | 4 ++--
hw/i386/acpi-build.c | 11 +++++------
2 files changed, 7 insertions(+), 8 deletions(-)
diff --git a/hw/i386/acpi-dsdt-isa.dsl b/hw/i386/acpi-dsdt-isa.dsl
index 46942c1..3a6e100 100644
--- a/hw/i386/acpi-dsdt-isa.dsl
+++ b/hw/i386/acpi-dsdt-isa.dsl
@@ -19,8 +19,8 @@ Scope(\_SB.PCI0.ISA) {
Device (SMC) {
Name(_HID, EisaId("APP0001"))
/* _STA will be patched to 0x0B if AppleSMC is present */
- ACPI_EXTRACT_NAME_WORD_CONST DSDT_APPLESMC_STA
- Name(_STA, 0xFF00)
+ ACPI_EXTRACT_NAME_BYTE_CONST DSDT_APPLESMC_STA
+ Name(_STA, 0xF0)
Name(_CRS, ResourceTemplate () {
IO (Decode16, 0x0300, 0x0300, 0x01, 0x20)
IRQNoFlags() { 6 }
diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index 30bfcd2..9e5733e 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -81,7 +81,7 @@ typedef struct AcpiMiscInfo {
static void acpi_get_dsdt(AcpiMiscInfo *info)
{
- unsigned short applesmc_sta_val, *applesmc_sta_off;
+ uint16_t *applesmc_sta;
Object *piix = piix4_pm_find();
Object *lpc = ich9_lpc_find();
assert(!!piix != !!lpc);
@@ -89,18 +89,17 @@ static void acpi_get_dsdt(AcpiMiscInfo *info)
if (piix) {
info->dsdt_code = AcpiDsdtAmlCode;
info->dsdt_size = sizeof AcpiDsdtAmlCode;
- applesmc_sta_off = piix_dsdt_applesmc_sta;
+ applesmc_sta = piix_dsdt_applesmc_sta;
}
if (lpc) {
info->dsdt_code = Q35AcpiDsdtAmlCode;
info->dsdt_size = sizeof Q35AcpiDsdtAmlCode;
- applesmc_sta_off = q35_dsdt_applesmc_sta;
+ applesmc_sta = q35_dsdt_applesmc_sta;
}
/* Patch in appropriate value for AppleSMC _STA */
- applesmc_sta_val = applesmc_find() ? 0x0b : 0x00;
- *(uint16_t *)(info->dsdt_code + *applesmc_sta_off) =
- cpu_to_le16(applesmc_sta_val);
+ *(uint8_t *)(info->dsdt_code + *applesmc_sta) =
+ applesmc_find() ? 0x0b : 0x00;
}
static
--
1.8.1.4