Introduce arch_memremap_exec and arch_memremap_exec_nocache for ARM to
allow mapping of memory as executable. Some platforms have a requirement
to map on-chip memory, such as SRAM, to hold and run code that cannot be
executed in DRAM, such as low-level PM code or code to reconfigure the
DRAM controller itself.
Signed-off-by: Dave Gerlach <d-gerlach@xxxxxx>
---
arch/arm/include/asm/io.h | 5 +++++
arch/arm/mm/ioremap.c | 16 ++++++++++++++++
arch/arm/mm/nommu.c | 12 ++++++++++++
3 files changed, 33 insertions(+)
diff --git a/arch/arm/include/asm/io.h b/arch/arm/include/asm/io.h
index 021692c64de3..67476a5add20 100644
--- a/arch/arm/include/asm/io.h
+++ b/arch/arm/include/asm/io.h
@@ -411,6 +411,11 @@ void __iomem *ioremap_wc(resource_size_t res_cookie, size_t size);
void iounmap(volatile void __iomem *iomem_cookie);
#define iounmap iounmap
+void *arch_memremap_exec(phys_addr_t phys_addr, size_t size);
+void *arch_memremap_exec_nocache(phys_addr_t phys_addr, size_t size);
+#define arch_memremap_exec arch_memremap_exec
+#define arch_memremap_exec_nocache arch_memremap_exec_nocache
+
void *arch_memremap_wb(phys_addr_t phys_addr, size_t size);
#define arch_memremap_wb arch_memremap_wb
diff --git a/arch/arm/mm/ioremap.c b/arch/arm/mm/ioremap.c
index ff0eed23ddf1..5c22a7a0b349 100644
--- a/arch/arm/mm/ioremap.c
+++ b/arch/arm/mm/ioremap.c
@@ -419,6 +419,22 @@ __arm_ioremap_exec(phys_addr_t phys_addr, size_t size, bool cached)
__builtin_return_address(0));
}
+void *arch_memremap_exec(phys_addr_t phys_addr, size_t size)
+{
+ return (__force void *)arch_ioremap_caller(phys_addr, size,
+ MT_MEMORY_RWX,
+ __builtin_return_address(0));
+}
+EXPORT_SYMBOL(arch_memremap_exec);
+
+void *arch_memremap_exec_nocache(phys_addr_t phys_addr, size_t size)
+{
+ return (__force void *)arch_ioremap_caller(phys_addr, size,
+ MT_MEMORY_RWX_NONCACHED,
+ __builtin_return_address(0));
+}
+EXPORT_SYMBOL(arch_memremap_exec_nocache);
+
void *arch_memremap_wb(phys_addr_t phys_addr, size_t size)
{
return (__force void *)arch_ioremap_caller(phys_addr, size,
diff --git a/arch/arm/mm/nommu.c b/arch/arm/mm/nommu.c
index 2740967727e2..038922133ec4 100644
--- a/arch/arm/mm/nommu.c
+++ b/arch/arm/mm/nommu.c
@@ -390,6 +390,18 @@ void *arch_memremap_wb(phys_addr_t phys_addr, size_t size)
return (void *)phys_addr;
}
+void *arch_memremap_exec(phys_addr_t phys_addr, size_t size)
+{
+ return (void *)phys_addr;
+}
+EXPORT_SYMBOL(arch_memremap_exec);
+
+void *arch_memremap_exec_nocache(phys_addr_t phys_addr, size_t size)
+{
+ return (void *)phys_addr;
+}
+EXPORT_SYMBOL(arch_memremap_exec_nocache);
+
void __iounmap(volatile void __iomem *addr)
{
}
--
2.9.3
--
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