[deliverable/linux.git] / arch / sparc64 / kernel / sun4v_tlb_miss.S

/* sun4v_tlb_miss.S: Sun4v TLB miss handlers.
 *
 * Copyright (C) 2006 <davem@davemloft.net>
 */

	.text
	.align	32

sun4v_itlb_miss:
	/* Load CPU ID into %g3.  */
	mov	SCRATCHPAD_CPUID, %g1
	ldxa	[%g1] ASI_SCRATCHPAD, %g3
	
	/* Load UTSB reg into %g1.  */
	ldxa	[%g1 + %g1] ASI_SCRATCHPAD, %g1

	/* Load &trap_block[smp_processor_id()] into %g2.  */
	sethi	%hi(trap_block), %g2
	or	%g2, %lo(trap_block), %g2
	sllx	%g3, TRAP_BLOCK_SZ_SHIFT, %g3
	add	%g2, %g3, %g2

	/* Create a TAG TARGET, "(vaddr>>22) | (ctx << 48)", in %g6.
	 * Branch if kernel TLB miss.  The kernel TSB and user TSB miss
	 * code wants the missing virtual address in %g4, so that value
	 * cannot be modified through the entirety of this handler.
	 */
	ldx	[%g2 + TRAP_PER_CPU_FAULT_INFO + HV_FAULT_I_ADDR_OFFSET], %g4
	ldx	[%g2 + TRAP_PER_CPU_FAULT_INFO + HV_FAULT_I_CTX_OFFSET], %g5
	srlx	%g4, 22, %g3
	sllx	%g5, 48, %g6
	or	%g6, %g3, %g6
	brz,pn	%g5, kvmap_itlb_4v
	 nop

	/* Create TSB pointer.  This is something like:
	 *
	 * index_mask = (512 << (tsb_reg & 0x7UL)) - 1UL;
	 * tsb_base = tsb_reg & ~0x7UL;
	 */
	and	%g1, 0x7, %g3
	andn	%g1, 0x7, %g1
	mov	512, %g7
	sllx	%g7, %g3, %g7
	sub	%g7, 1, %g7

	/* TSB index mask is in %g7, tsb base is in %g1.  Compute
	 * the TSB entry pointer into %g1:
	 *
	 * tsb_index = ((vaddr >> PAGE_SHIFT) & tsb_mask);
	 * tsb_ptr = tsb_base + (tsb_index * 16);
	 */
	srlx	%g4, PAGE_SHIFT, %g3
	and	%g3, %g7, %g3
	sllx	%g3, 4, %g3
	add	%g1, %g3, %g1

	/* Load TSB tag/pte into %g2/%g3 and compare the tag.  */
	ldda	[%g1] ASI_QUAD_LDD_PHYS, %g2
	cmp	%g2, %g6
	sethi	%hi(_PAGE_EXEC), %g7
	bne,a,pn %xcc, tsb_miss_page_table_walk
	 mov	FAULT_CODE_ITLB, %g3
	andcc	%g3, %g7, %g0
	be,a,pn	%xcc, tsb_do_fault
	 mov	FAULT_CODE_ITLB, %g3

	/* We have a valid entry, make hypervisor call to load
	 * I-TLB and return from trap.
	 *
	 * %g3:	PTE
	 * %g4:	vaddr
	 * %g6:	TAG TARGET (only "CTX << 48" part matters)
	 */
sun4v_itlb_load:
	mov	%o0, %g1		! save %o0
	mov	%o1, %g2		! save %o1
	mov	%o2, %g5		! save %o2
	mov	%o3, %g7		! save %o3
	mov	%g4, %o0		! vaddr
	srlx	%g6, 48, %o1		! ctx
	mov	%g3, %o2		! PTE
	mov	HV_MMU_IMMU, %o3	! flags
	ta	HV_MMU_MAP_ADDR_TRAP
	mov	%g1, %o0		! restore %o0
	mov	%g2, %o1		! restore %o1
	mov	%g5, %o2		! restore %o2
	mov	%g7, %o3		! restore %o3

	retry

sun4v_dtlb_miss:
	/* Load CPU ID into %g3.  */
	mov	SCRATCHPAD_CPUID, %g1
	ldxa	[%g1] ASI_SCRATCHPAD, %g3
	
	/* Load UTSB reg into %g1.  */
	ldxa	[%g1 + %g1] ASI_SCRATCHPAD, %g1

	/* Load &trap_block[smp_processor_id()] into %g2.  */
	sethi	%hi(trap_block), %g2
	or	%g2, %lo(trap_block), %g2
	sllx	%g3, TRAP_BLOCK_SZ_SHIFT, %g3
	add	%g2, %g3, %g2

	/* Create a TAG TARGET, "(vaddr>>22) | (ctx << 48)", in %g6.
	 * Branch if kernel TLB miss.  The kernel TSB and user TSB miss
	 * code wants the missing virtual address in %g4, so that value
	 * cannot be modified through the entirety of this handler.
	 */
	ldx	[%g2 + TRAP_PER_CPU_FAULT_INFO + HV_FAULT_D_ADDR_OFFSET], %g4
	ldx	[%g2 + TRAP_PER_CPU_FAULT_INFO + HV_FAULT_D_CTX_OFFSET], %g5
	srlx	%g4, 22, %g3
	sllx	%g5, 48, %g6
	or	%g6, %g3, %g6
	brz,pn	%g5, kvmap_dtlb_4v
	 nop

	/* Create TSB pointer.  This is something like:
	 *
	 * index_mask = (512 << (tsb_reg & 0x7UL)) - 1UL;
	 * tsb_base = tsb_reg & ~0x7UL;
	 */
	and	%g1, 0x7, %g3
	andn	%g1, 0x7, %g1
	mov	512, %g7
	sllx	%g7, %g3, %g7
	sub	%g7, 1, %g7

	/* TSB index mask is in %g7, tsb base is in %g1.  Compute
	 * the TSB entry pointer into %g1:
	 *
	 * tsb_index = ((vaddr >> PAGE_SHIFT) & tsb_mask);
	 * tsb_ptr = tsb_base + (tsb_index * 16);
	 */
	srlx	%g4, PAGE_SHIFT, %g3
	and	%g3, %g7, %g3
	sllx	%g3, 4, %g3
	add	%g1, %g3, %g1

	/* Load TSB tag/pte into %g2/%g3 and compare the tag.  */
	ldda	[%g1] ASI_QUAD_LDD_PHYS, %g2
	cmp	%g2, %g6
	bne,a,pn %xcc, tsb_miss_page_table_walk
	 mov	FAULT_CODE_ITLB, %g3

	/* We have a valid entry, make hypervisor call to load
	 * D-TLB and return from trap.
	 *
	 * %g3:	PTE
	 * %g4:	vaddr
	 * %g6:	TAG TARGET (only "CTX << 48" part matters)
	 */
sun4v_dtlb_load:
	mov	%o0, %g1		! save %o0
	mov	%o1, %g2		! save %o1
	mov	%o2, %g5		! save %o2
	mov	%o3, %g7		! save %o3
	mov	%g4, %o0		! vaddr
	srlx	%g6, 48, %o1		! ctx
	mov	%g3, %o2		! PTE
	mov	HV_MMU_DMMU, %o3	! flags
	ta	HV_MMU_MAP_ADDR_TRAP
	mov	%g1, %o0		! restore %o0
	mov	%g2, %o1		! restore %o1
	mov	%g5, %o2		! restore %o2
	mov	%g7, %o3		! restore %o3

	retry

sun4v_dtlb_prot:
	/* Load CPU ID into %g3.  */
	mov	SCRATCHPAD_CPUID, %g1
	ldxa	[%g1] ASI_SCRATCHPAD, %g3
	
	/* Load &trap_block[smp_processor_id()] into %g2.  */
	sethi	%hi(trap_block), %g2
	or	%g2, %lo(trap_block), %g2
	sllx	%g3, TRAP_BLOCK_SZ_SHIFT, %g3
	add	%g2, %g3, %g2

	ldx	[%g2 + TRAP_PER_CPU_FAULT_INFO + HV_FAULT_D_ADDR_OFFSET], %g5
	rdpr	%tl, %g1
	cmp	%g1, 1
	bgu,pn		%xcc, winfix_trampoline
	 nop
	ba,pt		%xcc, sparc64_realfault_common
	 mov		FAULT_CODE_DTLB | FAULT_CODE_WRITE, %g4

#define BRANCH_ALWAYS	0x10680000
#define NOP		0x01000000
#define SUN4V_DO_PATCH(OLD, NEW)	\
	sethi	%hi(NEW), %g1; \
	or	%g1, %lo(NEW), %g1; \
	sethi	%hi(OLD), %g2; \
	or	%g2, %lo(OLD), %g2; \
	sub	%g1, %g2, %g1; \
	sethi	%hi(BRANCH_ALWAYS), %g3; \
	srl	%g1, 2, %g1; \
	or	%g3, %lo(BRANCH_ALWAYS), %g3; \
	or	%g3, %g1, %g3; \
	stw	%g3, [%g2]; \
	sethi	%hi(NOP), %g3; \
	or	%g3, %lo(NOP), %g3; \
	stw	%g3, [%g2 + 0x4]; \
	flush	%g2;

	.globl	sun4v_patch_tlb_handlers
	.type	sun4v_patch_tlb_handlers,#function
sun4v_patch_tlb_handlers:
	SUN4V_DO_PATCH(tl0_iamiss, sun4v_itlb_miss)
	SUN4V_DO_PATCH(tl1_iamiss, sun4v_itlb_miss)
	SUN4V_DO_PATCH(tl0_damiss, sun4v_dtlb_miss)
	SUN4V_DO_PATCH(tl1_damiss, sun4v_dtlb_miss)
	SUN4V_DO_PATCH(tl0_daprot, sun4v_dtlb_prot)
	SUN4V_DO_PATCH(tl1_daprot, sun4v_dtlb_prot)
	retl
	 nop
	.size	sun4v_patch_tlb_handlers,.-sun4v_patch_tlb_handlers
Commit	Line	Data
d257d5da DM	1	/* sun4v_tlb_miss.S: Sun4v TLB miss handlers.
	2	*
	3	* Copyright (C) 2006 <davem@davemloft.net>
	4	*/
	5
	6	.text
	7	.align 32
	8
	9	sun4v_itlb_miss:
	10	/* Load CPU ID into %g3. */
	11	mov SCRATCHPAD_CPUID, %g1
	12	ldxa [%g1] ASI_SCRATCHPAD, %g3
	13
	14	/* Load UTSB reg into %g1. */
	15	ldxa [%g1 + %g1] ASI_SCRATCHPAD, %g1
	16
	17	/* Load &trap_block[smp_processor_id()] into %g2. */
	18	sethi %hi(trap_block), %g2
	19	or %g2, %lo(trap_block), %g2
	20	sllx %g3, TRAP_BLOCK_SZ_SHIFT, %g3
	21	add %g2, %g3, %g2
	22
	23	/* Create a TAG TARGET, "(vaddr>>22) \| (ctx << 48)", in %g6.
	24	* Branch if kernel TLB miss. The kernel TSB and user TSB miss
	25	* code wants the missing virtual address in %g4, so that value
	26	* cannot be modified through the entirety of this handler.
	27	*/
	28	ldx [%g2 + TRAP_PER_CPU_FAULT_INFO + HV_FAULT_I_ADDR_OFFSET], %g4
	29	ldx [%g2 + TRAP_PER_CPU_FAULT_INFO + HV_FAULT_I_CTX_OFFSET], %g5
	30	srlx %g4, 22, %g3
	31	sllx %g5, 48, %g6
	32	or %g6, %g3, %g6
	33	brz,pn %g5, kvmap_itlb_4v
	34	nop
	35
	36	/* Create TSB pointer. This is something like:
	37	*
	38	* index_mask = (512 << (tsb_reg & 0x7UL)) - 1UL;
	39	* tsb_base = tsb_reg & ~0x7UL;
	40	*/
	41	and %g1, 0x7, %g3
	42	andn %g1, 0x7, %g1
	43	mov 512, %g7
	44	sllx %g7, %g3, %g7
	45	sub %g7, 1, %g7
	46
	47	/* TSB index mask is in %g7, tsb base is in %g1. Compute
	48	* the TSB entry pointer into %g1:
	49	*
	50	* tsb_index = ((vaddr >> PAGE_SHIFT) & tsb_mask);
	51	* tsb_ptr = tsb_base + (tsb_index * 16);
	52	*/
	53	srlx %g4, PAGE_SHIFT, %g3
	54	and %g3, %g7, %g3
	55	sllx %g3, 4, %g3
	56	add %g1, %g3, %g1
	57
	58	/* Load TSB tag/pte into %g2/%g3 and compare the tag. */
	59	ldda [%g1] ASI_QUAD_LDD_PHYS, %g2
	60	cmp %g2, %g6
	61	sethi %hi(_PAGE_EXEC), %g7
	62	bne,a,pn %xcc, tsb_miss_page_table_walk
	63	mov FAULT_CODE_ITLB, %g3
	64	andcc %g3, %g7, %g0
65	be,a,pn %xcc, tsb_do_fault
66	mov FAULT_CODE_ITLB, %g3
67
68	/* We have a valid entry, make hypervisor call to load
69	* I-TLB and return from trap.
70	*
71	* %g3: PTE
72	* %g4: vaddr
73	* %g6: TAG TARGET (only "CTX << 48" part matters)
74	*/
75	sun4v_itlb_load:
76	mov %o0, %g1 ! save %o0
77	mov %o1, %g2 ! save %o1
78	mov %o2, %g5 ! save %o2
79	mov %o3, %g7 ! save %o3
80	mov %g4, %o0 ! vaddr
81	srlx %g6, 48, %o1 ! ctx
82	mov %g3, %o2 ! PTE
83	mov HV_MMU_IMMU, %o3 ! flags
84	ta HV_MMU_MAP_ADDR_TRAP
85	mov %g1, %o0 ! restore %o0
86	mov %g2, %o1 ! restore %o1
87	mov %g5, %o2 ! restore %o2
88	mov %g7, %o3 ! restore %o3
89
90	retry
91
92	sun4v_dtlb_miss:
93	/* Load CPU ID into %g3. */
94	mov SCRATCHPAD_CPUID, %g1
95	ldxa [%g1] ASI_SCRATCHPAD, %g3
96
97	/* Load UTSB reg into %g1. */
98	ldxa [%g1 + %g1] ASI_SCRATCHPAD, %g1
99
100	/* Load &trap_block[smp_processor_id()] into %g2. */
101	sethi %hi(trap_block), %g2
102	or %g2, %lo(trap_block), %g2
103	sllx %g3, TRAP_BLOCK_SZ_SHIFT, %g3
104	add %g2, %g3, %g2
105
106	/* Create a TAG TARGET, "(vaddr>>22) \| (ctx << 48)", in %g6.
107	* Branch if kernel TLB miss. The kernel TSB and user TSB miss
108	* code wants the missing virtual address in %g4, so that value
109	* cannot be modified through the entirety of this handler.
110	*/
111	ldx [%g2 + TRAP_PER_CPU_FAULT_INFO + HV_FAULT_D_ADDR_OFFSET], %g4
112	ldx [%g2 + TRAP_PER_CPU_FAULT_INFO + HV_FAULT_D_CTX_OFFSET], %g5
113	srlx %g4, 22, %g3
114	sllx %g5, 48, %g6
115	or %g6, %g3, %g6
116	brz,pn %g5, kvmap_dtlb_4v
117	nop
118
119	/* Create TSB pointer. This is something like:
120	*
121	* index_mask = (512 << (tsb_reg & 0x7UL)) - 1UL;
122	* tsb_base = tsb_reg & ~0x7UL;
123	*/
124	and %g1, 0x7, %g3
125	andn %g1, 0x7, %g1
126	mov 512, %g7
127	sllx %g7, %g3, %g7
128	sub %g7, 1, %g7
129
130	/* TSB index mask is in %g7, tsb base is in %g1. Compute
131	* the TSB entry pointer into %g1:
132	*
133	* tsb_index = ((vaddr >> PAGE_SHIFT) & tsb_mask);
134	* tsb_ptr = tsb_base + (tsb_index * 16);
135	*/
136	srlx %g4, PAGE_SHIFT, %g3
137	and %g3, %g7, %g3
138	sllx %g3, 4, %g3
139	add %g1, %g3, %g1
140
141	/* Load TSB tag/pte into %g2/%g3 and compare the tag. */
142	ldda [%g1] ASI_QUAD_LDD_PHYS, %g2
143	cmp %g2, %g6
144	bne,a,pn %xcc, tsb_miss_page_table_walk
145	mov FAULT_CODE_ITLB, %g3
146
147	/* We have a valid entry, make hypervisor call to load
148	* D-TLB and return from trap.
149	*
150	* %g3: PTE
151	* %g4: vaddr
152	* %g6: TAG TARGET (only "CTX << 48" part matters)
153	*/
154	sun4v_dtlb_load:
155	mov %o0, %g1 ! save %o0
156	mov %o1, %g2 ! save %o1
157	mov %o2, %g5 ! save %o2
158	mov %o3, %g7 ! save %o3
159	mov %g4, %o0 ! vaddr
160	srlx %g6, 48, %o1 ! ctx
161	mov %g3, %o2 ! PTE
162	mov HV_MMU_DMMU, %o3 ! flags
163	ta HV_MMU_MAP_ADDR_TRAP
164	mov %g1, %o0 ! restore %o0
165	mov %g2, %o1 ! restore %o1
166	mov %g5, %o2 ! restore %o2
167	mov %g7, %o3 ! restore %o3
168
169	retry
170
171	sun4v_dtlb_prot:
172	/* Load CPU ID into %g3. */
173	mov SCRATCHPAD_CPUID, %g1
174	ldxa [%g1] ASI_SCRATCHPAD, %g3
175
176	/* Load &trap_block[smp_processor_id()] into %g2. */
177	sethi %hi(trap_block), %g2
178	or %g2, %lo(trap_block), %g2
179	sllx %g3, TRAP_BLOCK_SZ_SHIFT, %g3
180	add %g2, %g3, %g2
181
182	ldx [%g2 + TRAP_PER_CPU_FAULT_INFO + HV_FAULT_D_ADDR_OFFSET], %g5
183	rdpr %tl, %g1
184	cmp %g1, 1
185	bgu,pn %xcc, winfix_trampoline
186	nop
187	ba,pt %xcc, sparc64_realfault_common
188	mov FAULT_CODE_DTLB \| FAULT_CODE_WRITE, %g4
189
190	#define BRANCH_ALWAYS 0x10680000
191	#define NOP 0x01000000
192	#define SUN4V_DO_PATCH(OLD, NEW) \
193	sethi %hi(NEW), %g1; \
194	or %g1, %lo(NEW), %g1; \
195	sethi %hi(OLD), %g2; \
196	or %g2, %lo(OLD), %g2; \
197	sub %g1, %g2, %g1; \
198	sethi %hi(BRANCH_ALWAYS), %g3; \
199	srl %g1, 2, %g1; \
200	or %g3, %lo(BRANCH_ALWAYS), %g3; \
201	or %g3, %g1, %g3; \
202	stw %g3, [%g2]; \
203	sethi %hi(NOP), %g3; \
204	or %g3, %lo(NOP), %g3; \
205	stw %g3, [%g2 + 0x4]; \
206	flush %g2;
207
208	.globl sun4v_patch_tlb_handlers
209	.type sun4v_patch_tlb_handlers,#function
210	sun4v_patch_tlb_handlers:
211	SUN4V_DO_PATCH(tl0_iamiss, sun4v_itlb_miss)
212	SUN4V_DO_PATCH(tl1_iamiss, sun4v_itlb_miss)
213	SUN4V_DO_PATCH(tl0_damiss, sun4v_dtlb_miss)
214	SUN4V_DO_PATCH(tl1_damiss, sun4v_dtlb_miss)
215	SUN4V_DO_PATCH(tl0_daprot, sun4v_dtlb_prot)
216	SUN4V_DO_PATCH(tl1_daprot, sun4v_dtlb_prot)
217	retl
218	nop
219	.size sun4v_patch_tlb_handlers,.-sun4v_patch_tlb_handlers