From: Rouven Czerwinski <r.czerwinski@pengutronix.de>
To: barebox@lists.infradead.org
Cc: Rouven Czerwinski <r.czerwinski@pengutronix.de>
Subject: [PATCH 1/8] ARM: MMU: add zero_page_{access,faulting}
Date: Mon, 9 Nov 2020 14:44:23 +0100 [thread overview]
Message-ID: <20201109134430.21156-2-r.czerwinski@pengutronix.de> (raw)
In-Reply-To: <20201109134430.21156-1-r.czerwinski@pengutronix.de>
On the qemu virt machine, the cfi flash is mapped at 0x0.
Therefore implement zero_page_{access,faulting} to allow usage of the
cfi_flash driver on this machine.
Signed-off-by: Rouven Czerwinski <r.czerwinski@pengutronix.de>
---
arch/arm/cpu/Kconfig | 1 -
arch/arm/cpu/mmu.c | 13 +++++++++++++
include/zero_page.h | 14 --------------
lib/Kconfig | 3 ---
4 files changed, 13 insertions(+), 18 deletions(-)
diff --git a/arch/arm/cpu/Kconfig b/arch/arm/cpu/Kconfig
index ca3bd98962..f9f52a6252 100644
--- a/arch/arm/cpu/Kconfig
+++ b/arch/arm/cpu/Kconfig
@@ -89,7 +89,6 @@ config CPU_V8
select ARM_EXCEPTIONS
select GENERIC_FIND_NEXT_BIT
select ARCH_HAS_STACK_DUMP
- select ARCH_HAS_ZERO_PAGE
config CPU_XSC3
bool
diff --git a/arch/arm/cpu/mmu.c b/arch/arm/cpu/mmu.c
index 6af228505d..bfb8eab5f5 100644
--- a/arch/arm/cpu/mmu.c
+++ b/arch/arm/cpu/mmu.c
@@ -17,6 +17,7 @@
#include <memory.h>
#include <asm/system_info.h>
#include <asm/sections.h>
+#include <zero_page.h>
#include "mmu.h"
@@ -354,6 +355,18 @@ static void create_zero_page(void)
}
}
+void zero_page_access(void)
+{
+ arm_create_pte(0x0, pte_flags_cached);
+}
+
+void zero_page_faulting(void)
+{
+ u32 *zero;
+ zero = arm_create_pte(0x0, pte_flags_uncached);
+ zero[0] = 0;
+}
+
/*
* Map vectors and zero page
*/
diff --git a/include/zero_page.h b/include/zero_page.h
index ad6861f240..b0efb814db 100644
--- a/include/zero_page.h
+++ b/include/zero_page.h
@@ -4,8 +4,6 @@
#include <common.h>
-#if defined CONFIG_ARCH_HAS_ZERO_PAGE
-
/*
* zero_page_faulting - fault when accessing the zero page
*/
@@ -20,18 +18,6 @@ void zero_page_faulting(void);
*/
void zero_page_access(void);
-#else
-
-static inline void zero_page_faulting(void)
-{
-}
-
-static inline void zero_page_access(void)
-{
-}
-
-#endif
-
static inline bool zero_page_contains(unsigned long addr)
{
return addr < PAGE_SIZE;
diff --git a/lib/Kconfig b/lib/Kconfig
index e5831ecdb9..887f50ff00 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -182,9 +182,6 @@ config ARCH_HAS_STACK_DUMP
config ARCH_HAS_DATA_ABORT_MASK
bool
-config ARCH_HAS_ZERO_PAGE
- bool
-
config HAVE_EFFICIENT_UNALIGNED_ACCESS
bool
--
2.28.0
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next prev parent reply other threads:[~2020-11-09 13:44 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-09 13:44 [PATCH 0/8] QEMU virt machine support via mach-vexpress Rouven Czerwinski
2020-11-09 13:44 ` Rouven Czerwinski [this message]
2020-11-09 13:44 ` [PATCH 2/8] mtd: cfi_flash: allow 0x0 mapping Rouven Czerwinski
2020-11-09 13:52 ` Lucas Stach
2020-11-10 6:33 ` Rouven Czerwinski
2020-11-10 7:48 ` Sascha Hauer
2020-11-10 9:15 ` Sascha Hauer
2020-11-10 9:36 ` Ahmad Fatoum
2020-11-10 9:43 ` Ahmad Fatoum
2020-11-12 10:06 ` Sascha Hauer
2020-11-12 10:09 ` Rouven Czerwinski
2020-11-09 13:44 ` [PATCH 3/8] amba: add *_amba_driver helper macros Rouven Czerwinski
2020-11-09 13:44 ` [PATCH 4/8] ARM: vexpress: remove unused KConfig file Rouven Czerwinski
2020-11-09 13:44 ` [PATCH 5/8] ARM: vexpress: convert to board driver Rouven Czerwinski
2020-11-09 13:44 ` [PATCH 6/8] ARM: vexpress: move Options to ARCH_VEXPRESS Rouven Czerwinski
2020-11-09 13:44 ` [PATCH 7/8] ARM: qemu: add support for qemu virt platform Rouven Czerwinski
2020-11-09 13:44 ` [PATCH 8/8] ARM: vexpress: enable VIRT board, MMU and cmds Rouven Czerwinski
2020-11-12 10:30 ` [PATCH 0/8] QEMU virt machine support via mach-vexpress Sascha Hauer
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