powerpc/pseries: Add hcall to read 4 ptes at a time in real mode
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>
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3 changed files with 57 additions and 0 deletions
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@ -282,6 +282,7 @@ long plpar_hcall_raw(unsigned long opcode, unsigned long *retbuf, ...);
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*/
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#define PLPAR_HCALL9_BUFSIZE 9
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long plpar_hcall9(unsigned long opcode, unsigned long *retbuf, ...);
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long plpar_hcall9_raw(unsigned long opcode, unsigned long *retbuf, ...);
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/* For hcall instrumentation. One structure per-hcall, per-CPU */
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struct hcall_stats {
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@ -228,3 +228,41 @@ _GLOBAL(plpar_hcall9)
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mtcrf 0xff,r0
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blr /* return r3 = status */
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/* See plpar_hcall_raw to see why this is needed */
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_GLOBAL(plpar_hcall9_raw)
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HMT_MEDIUM
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mfcr r0
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stw r0,8(r1)
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std r4,STK_PARM(r4)(r1) /* Save ret buffer */
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mr r4,r5
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mr r5,r6
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mr r6,r7
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mr r7,r8
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mr r8,r9
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mr r9,r10
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ld r10,STK_PARM(r11)(r1) /* put arg7 in R10 */
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ld r11,STK_PARM(r12)(r1) /* put arg8 in R11 */
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ld r12,STK_PARM(r13)(r1) /* put arg9 in R12 */
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HVSC /* invoke the hypervisor */
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mr r0,r12
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ld r12,STK_PARM(r4)(r1)
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std r4, 0(r12)
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std r5, 8(r12)
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std r6, 16(r12)
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std r7, 24(r12)
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std r8, 32(r12)
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std r9, 40(r12)
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std r10,48(r12)
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std r11,56(r12)
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std r0, 64(r12)
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lwz r0,8(r1)
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mtcrf 0xff,r0
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blr /* return r3 = status */
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@ -191,6 +191,24 @@ static inline long plpar_pte_read_raw(unsigned long flags, unsigned long ptex,
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return rc;
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}
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/*
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* plpar_pte_read_4_raw can be called in real mode.
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* ptes must be 8*sizeof(unsigned long)
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*/
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static inline long plpar_pte_read_4_raw(unsigned long flags, unsigned long ptex,
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unsigned long *ptes)
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{
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long rc;
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unsigned long retbuf[PLPAR_HCALL9_BUFSIZE];
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rc = plpar_hcall9_raw(H_READ, retbuf, flags | H_READ_4, ptex);
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memcpy(ptes, retbuf, 8*sizeof(unsigned long));
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return rc;
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}
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static inline long plpar_pte_protect(unsigned long flags, unsigned long ptex,
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unsigned long avpn)
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{
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