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kvm: Use 32-bit operand size prefix for rdfs8()

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E820 memory map resides in EBDA region which starts at address 0x9fc00 which
doesn't fit in 16 bits. Therefore, use 'addr32' operand size prefix to fix the
following error:

  bios/e820.c: Assembler messages:
  bios/e820.c:14: Warning: 654336 shortened to 64512

Acked-by: Cyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
This commit is contained in:
Pekka Enberg
2015-06-01 16:39:40 +01:00
committed by Will Deacon
parent 2346d461f0
commit 8cc7d24b4f
1 changed files with 3 additions and 1 deletions
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bios/e820.c
+3 -1
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@@ -11,7 +11,9 @@ static inline void outb(uint8_t v, uint16_t port)
static inline uint8_t rdfs8(unsigned long addr)
{
uint8_t v;
asm volatile("movb %%fs:%1,%0" : "=q" (v) : "m" (*(uint8_t *)addr));
asm volatile("addr32 movb %%fs:%1,%0" : "=q" (v) : "m" (*(uint8_t *)addr));
return v;
}