New patch to review for coreboot: libpayload: x86: Add read/write{8, 16, 32} variants that match coreboot

[Patrick Georgi]

Patrick Georgi ([e-mail]) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/11405

-gerrit

commit cb9270169adbc082231e6b85621d847fbb1f69b7
Author: Duncan Laurie 
Date:   Wed Aug 19 16:04:15 2015 -0700

libpayload: x86: Add read/write{8,16,32} variants that match coreboot

Add the now coreboot standard MMIO read/write accessors that were
    already defined for other architectures but not x86.

This leaves the old read/write{b,w,l} variants in place as was done
    on the other architectures, presumably to support old payloads that
    have not been updated.

BUG=chrome-os-partner:43072
    BRANCH=none
    TEST=emerge-glados libpayload
    CQ-DEPEND=CL:294711

Change-Id: I5ae3d755adcef0f6ff27aaa7c35a5b12ddc32e22
    Signed-off-by: Patrick Georgi 
    Original-Commit-Id: c09dd557050e3002fa5b8504980d72d4cb79a56c
    Original-Change-Id: I58d928338335d3fe4bb7fe2bdc9c2967d8689118
    Original-Signed-off-by: Duncan Laurie 
    Original-Reviewed-on: https://chromium-review.googlesource.com/294565
    Original-Reviewed-by: Aaron Durbin 
---
 payloads/libpayload/include/x86/arch/io.h | 40 +++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/payloads/libpayload/include/x86/arch/io.h b/payloads/libpayload/include/x86/arch/io.h
index cd48d7c..c417ce0 100644
--- a/payloads/libpayload/include/x86/arch/io.h
+++ b/payloads/libpayload/include/x86/arch/io.h
@@ -31,6 +31,16 @@
 #ifndef _ARCH_IO_H
 #define _ARCH_IO_H

+#include <inttypes.h>
+
+/*
+ * readb/w/l writeb/w/l are deprecated. use read8/16/32 and write8/16/32
+ * instead for future development.
+ *
+ * TODO: make the existing code use read8/16/32 and write8/16/32 then remove
+ * readb/w/l and writeb/w/l.
+ */
+
 #define readb(_a) (*(volatile const unsigned char *) (_a))
 #define readw(_a) (*(volatile const unsigned short *) (_a))
 #define readl(_a) (*(volatile const unsigned int *) (_a))
@@ -39,6 +49,36 @@
 #define writew(_v, _a) (*(volatile unsigned short *) (_a) = (_v))
 #define writel(_v, _a) (*(volatile unsigned int *) (_a) = (_v))

+static inline __attribute__((always_inline)) uint8_t read8(const volatile void *addr)
+{
+	return *((volatile uint8_t *)(addr));
+}
+
+static inline __attribute__((always_inline)) uint16_t read16(const volatile void *addr)
+{
+	return *((volatile uint16_t *)(addr));
+}
+
+static inline __attribute__((always_inline)) uint32_t read32(const volatile void *addr)
+{
+	return *((volatile uint32_t *)(addr));
+}
+
+static inline __attribute__((always_inline)) void write8(volatile void *addr, uint8_t value)
+{
+	*((volatile uint8_t *)(addr)) = value;
+}
+
+static inline __attribute__((always_inline)) void write16(volatile void *addr, uint16_t value)
+{
+	*((volatile uint16_t *)(addr)) = value;
+}
+
+static inline __attribute__((always_inline)) void write32(volatile void *addr, uint32_t value)
+{
+	*((volatile uint32_t *)(addr)) = value;
+}
+
 static inline unsigned int inl(int port)
 {
    unsigned long val;