Make ioremap() remap just one page for now
Cc: Thomas Huth <thuth@xxxxxxxxxx>
Cc: Andrew Jones <drjones@xxxxxxxxxx>
Signed-off-by: Alexander Gordeev <agordeev@xxxxxxxxxx>
---
lib/x86/io.c | 12 ++++++++++++
lib/x86/io.h | 5 +++++
2 files changed, 17 insertions(+)
diff --git a/lib/x86/io.c b/lib/x86/io.c
index d3b971ef67b0..628813926725 100644
--- a/lib/x86/io.c
+++ b/lib/x86/io.c
@@ -1,6 +1,7 @@
#include "libcflat.h"
#include "smp.h"
#include "io.h"
+#include "vm.h"
#ifndef USE_SERIAL
#define USE_SERIAL
#endif
@@ -81,3 +82,14 @@ void exit(int code)
asm volatile("out %0, %1" : : "a"(code), "d"((short)0xf4));
#endif
}
+
+void __iomem *ioremap(phys_addr_t phys_addr, size_t size __unused)
+{
+ phys_addr_t base = ALIGN(phys_addr, PAGE_SIZE);
+ phys_addr_t offset = phys_addr - base;
+ void *page = alloc_vpages(1);
+
+ install_page((void*)read_cr3(), base, page);
+
+ return page + offset;
+}
diff --git a/lib/x86/io.h b/lib/x86/io.h
index bd6341c6c103..730786411fb3 100644
--- a/lib/x86/io.h
+++ b/lib/x86/io.h
@@ -1,6 +1,8 @@
#ifndef IO_H
#define IO_H
+#define __iomem
+
static inline unsigned char inb(unsigned short port)
{
unsigned char value;
@@ -37,4 +39,7 @@ static inline void outl(unsigned int value, unsigned short port)
asm volatile("outl %0, %w1" : : "a"(value), "Nd"(port));
}
+#define ioremap ioremap
+void __iomem *ioremap(phys_addr_t phys_addr, size_t size __unused);
+
#endif
--
1.8.3.1
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