powerpc/kvm/tm.S

1 /* SPDX-License-Identifier: GPL-2.0-only */
12 #include <asm/asm-offsets.h>
20  * Save transactional state and TM-related registers.
22  * - r3 pointing to the vcpu struct
23  * - r4 containing the MSR with current TS bits:
25  * - r5 containing a flag indicating that non-volatile registers
34 	stdu    r1, -SWITCH_FRAME_SIZE(r1)
43 	rldimi	r8, r0, MSR_TM_LG, 63-MSR_TM_LG
48 	rldicl. r4, r4, 64 - MSR_TS_S_LG, 62
54 	/* Save CR on the stack - even if r5 == 0 we need to get cr7 back. */
64 	 * registers.  Save the non-volatile registers on the stack if
65 	 * preservation of non-volatile state has been requested.
70 	/* MSR[TS] will be 0 (non-transactional) once we do treclaim. */
72 	rldimi	r10, r0, MSR_TS_S_LG, 63 - MSR_TS_T_LG
89 	/* All GPRs are volatile at this point. */
115 	/* Save all but r0-r2, r9 & r13 */
161 	/* Restore non-volatile registers if requested to */
195 	stdu    r1, -PPC_MIN_STKFRM(r1)
198 	std	r8, PPC_MIN_STKFRM-8(r1)
200 	li	r5, 1		/* preserve non-volatile registers */
203 	ld	r8, PPC_MIN_STKFRM-8(r1)
214  * Restore transactional state and TM-related registers.
216  *  - r3 pointing to the vcpu struct.
217  *  - r4 is the guest MSR with desired TS bits:
220  * - r5 containing a flag indicating that non-volatile registers
254 	rldicl. r5, r5, 64 - MSR_TS_S_LG, 62
266 	 * Make a stack frame and save non-volatile registers if requested.
268 	stdu	r1, -SWITCH_FRAME_SIZE(r1)
282 	rldimi	r10, r0, MSR_TS_S_LG, 63 - MSR_TS_T_LG
325 	/* Load GPRs r0-r28 */
340 	/* TM checkpointed state is now setup.  All GPRs are now volatile. */
359 	/* Restore non-volatile registers if requested to. */
380 	stdu    r1, -PPC_MIN_STKFRM(r1)
384 	std	r8, PPC_MIN_STKFRM-8(r1)
389 	ld	r8, PPC_MIN_STKFRM-8(r1)