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powerpc/pseries: Add hcall to read 4 ptes at a time in real mode

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This adds plpar_pte_read_4_raw() which can be used read 4 PTEs from
PHYP at a time, while in real mode.

It also creates a new hcall9 which can be used in real mode.  It's the
same as plpar_hcall9 but minus the tracing hcall statistics which may
require variables outside the RMO.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Michael Neuling 2010-05-10 20:28:26 +00:00 committed by Benjamin Herrenschmidt
parent 095c7965f4
commit f90ece28c1
3 changed files with 57 additions and 0 deletions
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1
arch/powerpc/include/asm/hvcall.h
View file

@ -282,6 +282,7 @@ long plpar_hcall_raw(unsigned long opcode, unsigned long *retbuf, ...);
*/
#define PLPAR_HCALL9_BUFSIZE 9
long plpar_hcall9(unsigned long opcode, unsigned long *retbuf, ...);
long plpar_hcall9_raw(unsigned long opcode, unsigned long *retbuf, ...);
/* For hcall instrumentation. One structure per-hcall, per-CPU */
struct hcall_stats {

38
arch/powerpc/platforms/pseries/hvCall.S
View file

@ -228,3 +228,41 @@ _GLOBAL(plpar_hcall9)
mtcrf 0xff,r0
blr /* return r3 = status */
/* See plpar_hcall_raw to see why this is needed */
_GLOBAL(plpar_hcall9_raw)
HMT_MEDIUM
mfcr r0
stw r0,8(r1)
std r4,STK_PARM(r4)(r1) /* Save ret buffer */
mr r4,r5
mr r5,r6
mr r6,r7
mr r7,r8
mr r8,r9
mr r9,r10
ld r10,STK_PARM(r11)(r1) /* put arg7 in R10 */
ld r11,STK_PARM(r12)(r1) /* put arg8 in R11 */
ld r12,STK_PARM(r13)(r1) /* put arg9 in R12 */
HVSC /* invoke the hypervisor */
mr r0,r12
ld r12,STK_PARM(r4)(r1)
std r4, 0(r12)
std r5, 8(r12)
std r6, 16(r12)
std r7, 24(r12)
std r8, 32(r12)
std r9, 40(r12)
std r10,48(r12)
std r11,56(r12)
std r0, 64(r12)
lwz r0,8(r1)
mtcrf 0xff,r0
blr /* return r3 = status */

18
arch/powerpc/platforms/pseries/plpar_wrappers.h
View file

@ -191,6 +191,24 @@ static inline long plpar_pte_read_raw(unsigned long flags, unsigned long ptex,
return rc;
}
/*
* plpar_pte_read_4_raw can be called in real mode.
* ptes must be 8*sizeof(unsigned long)
*/
static inline long plpar_pte_read_4_raw(unsigned long flags, unsigned long ptex,
unsigned long *ptes)
{
long rc;
unsigned long retbuf[PLPAR_HCALL9_BUFSIZE];
rc = plpar_hcall9_raw(H_READ, retbuf, flags | H_READ_4, ptex);
memcpy(ptes, retbuf, 8*sizeof(unsigned long));
return rc;
}
static inline long plpar_pte_protect(unsigned long flags, unsigned long ptex,
unsigned long avpn)
{