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| author |   Christophe Leroy <christophe.leroy@c-s.fr> | 2019-04-30 12:38:51 +0000 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2019-05-03 01:20:27 +1000 |
| commit | 37737a2afd69c201d0dac334c84fd1f0d596dfc0 (patch) | |
| tree | 461d4806f47fef0c14fedc0708aadd98f5800280 /arch/powerpc/kernel/head_32.h | |
| parent | powerpc/32: Refactor EXCEPTION entry macros for head_8xx.S and head_32.S (diff) | |
| download | wireguard-linux-37737a2afd69c201d0dac334c84fd1f0d596dfc0.tar.xz wireguard-linux-37737a2afd69c201d0dac334c84fd1f0d596dfc0.zip | |
powerpc/32: move LOAD_MSR_KERNEL() into head_32.h and use it
As preparation for using head_32.h for head_40x.S, move
LOAD_MSR_KERNEL() there and use it to load r10 with MSR_KERNEL value.
In the mean time, this patch modifies it so that it takes into account
the size of the passed value to determine if 'li' can be used or if
'lis/ori' is needed instead of using the size of MSR_KERNEL. This is
done by using gas macro.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to '')
| -rw-r--r-- | arch/powerpc/kernel/head_32.h | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/head_32.h b/arch/powerpc/kernel/head_32.h index 7456e2a45acc..cf3d00844597 100644 --- a/arch/powerpc/kernel/head_32.h +++ b/arch/powerpc/kernel/head_32.h @@ -5,6 +5,19 @@ #include <asm/ptrace.h> /* for STACK_FRAME_REGS_MARKER */ /* + * MSR_KERNEL is > 0x8000 on 4xx/Book-E since it include MSR_CE. + */ +.macro __LOAD_MSR_KERNEL r, x +.if \x >= 0x8000 + lis \r, (\x)@h + ori \r, \r, (\x)@l +.else + li \r, (\x) +.endif +.endm +#define LOAD_MSR_KERNEL(r, x) __LOAD_MSR_KERNEL r, x + +/* * Exception entry code. This code runs with address translation * turned off, i.e. using physical addresses. * We assume sprg3 has the physical address of the current @@ -89,7 +102,7 @@ label: #define EXC_XFER_TEMPLATE(n, hdlr, trap, copyee, tfer, ret) \ li r10,trap; \ stw r10,_TRAP(r11); \ - li r10,MSR_KERNEL; \ + LOAD_MSR_KERNEL(r10, MSR_KERNEL); \ copyee(r10, r9); \ bl tfer; \ i##n: \ |