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| author | Madhavan Srinivasan <maddy@linux.vnet.ibm.com> | 2019-08-30 08:10:33 -0400 |
|---|---|---|
| committer | Ram Pai <linuxram@us.ibm.com> | 2020-11-02 19:35:09 -0500 |
| commit | 4d79433502d697a138625e6ca17d66590bc39d44 (patch) | |
| tree | 8d6efb15936b1b10a15720997a6d72b87a7caf61 | |
| parent | 1159dbc364b8cb839c42147c687070c18d52c07c (diff) | |
| download | skiboot-4d79433502d697a138625e6ca17d66590bc39d44.zip skiboot-4d79433502d697a138625e6ca17d66590bc39d44.tar.gz skiboot-4d79433502d697a138625e6ca17d66590bc39d44.tar.bz2 | |
pef: ultra-call support for skiboot
A new type of system call called the ultra call is used to get the
services of the ultravisor. This ultracall support is needed in skiboot
to access the xscoms which are in the secure memory area.
Signed-off-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
Signed-off-by: Santosh Sivaraj <santosh@fossix.org>
[ andmike: ABI hange to switch from r0 to r3 ]
Signed-off-by: Michael Anderson <andmike@linux.ibm.com>
[ grimm: Comments to start_uv for register usage ]
Signed-off-by: Ryan Grimm <grimm@linux.ibm.com>
| -rw-r--r-- | asm/head.S | 34 | ||||
| -rw-r--r-- | include/ultravisor.h | 1 |
2 files changed, 34 insertions, 1 deletions
@@ -1066,6 +1066,11 @@ start_kernel_secondary: mfspr %r3,SPR_PIR bctr +/* start_uv register usage: + * + * r3 is base address of UV + * r4 is ptr to struct uv_opal + */ .global start_uv start_uv: mflr %r0 @@ -1083,7 +1088,34 @@ start_uv: addi %r7,%r5,1 li %r4,0 li %r5,0 - bctrl + bctrl /* branch to UV here */ ld %r0,16(%r1) mtlr %r0 blr + +.global ucall +ucall: + mflr %r0 + stdu %r1,-STACK_FRAMESIZE(%r1) + std %r0,STACK_LR(%r1) + mfcr %r0 + stw %r0,STACK_CR(%r1) + std %r4,STACK_GPR4(%r1) /* Save ret buffer */ + mr %r4,%r5 + mr %r5,%r6 + mr %r6,%r7 + mr %r7,%r8 + mr %r8,%r9 + mr %r9,%r10 + sc 2 /* invoke the ultravisor */ + ld %r12,STACK_GPR4(%r1) + std %r4, 0(%r12) + std %r5, 8(%r12) + std %r6, 16(%r12) + std %r7, 24(%r12) + lwz %r0,STACK_CR(%r1) + mtcrf 0xff,%r0 + ld %r0,STACK_LR(%r1) + mtlr %r0 + addi %r1,%r1,STACK_FRAMESIZE + blr /* return r3 = status */ diff --git a/include/ultravisor.h b/include/ultravisor.h index a8310ac..04bacec 100644 --- a/include/ultravisor.h +++ b/include/ultravisor.h @@ -25,5 +25,6 @@ extern void uv_preload_image(void); extern void uv_decompress_image(void); extern void init_uv(void); extern int start_ultravisor(void); +extern long ucall(unsigned long opcode, unsigned long *retbuf, ...); #endif /* __ULTRAVISOR_H */ |