[SPARC64]: Detect sun4v early in boot process.
We look for "SUNW,sun4v" in the 'compatible' property
of the root OBP device tree node.
Protect every %ver register access, to make sure it is
not touched on sun4v, as %ver is hyperprivileged there.
Lock kernel TLB entries using hypervisor calls instead of
calls into OBP.
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc64/kernel/head.S b/arch/sparc64/kernel/head.S
index 0198001..d048f0d 100644
--- a/arch/sparc64/kernel/head.S
+++ b/arch/sparc64/kernel/head.S
@@ -95,12 +95,17 @@
wrpr %g1, 0x0, %pstate
ba,a,pt %xcc, 1f
- .globl prom_finddev_name, prom_chosen_path
- .globl prom_getprop_name, prom_mmu_name
- .globl prom_callmethod_name, prom_translate_name
+ .globl prom_finddev_name, prom_chosen_path, prom_root_node
+ .globl prom_getprop_name, prom_mmu_name, prom_peer_name
+ .globl prom_callmethod_name, prom_translate_name, prom_root_compatible
.globl prom_map_name, prom_unmap_name, prom_mmu_ihandle_cache
.globl prom_boot_mapped_pc, prom_boot_mapping_mode
.globl prom_boot_mapping_phys_high, prom_boot_mapping_phys_low
+ .globl is_sun4v
+prom_peer_name:
+ .asciz "peer"
+prom_compatible_name:
+ .asciz "compatible"
prom_finddev_name:
.asciz "finddevice"
prom_chosen_path:
@@ -117,7 +122,13 @@
.asciz "map"
prom_unmap_name:
.asciz "unmap"
+prom_sun4v_name:
+ .asciz "SUNW,sun4v"
.align 4
+prom_root_compatible:
+ .skip 64
+prom_root_node:
+ .word 0
prom_mmu_ihandle_cache:
.word 0
prom_boot_mapped_pc:
@@ -129,8 +140,54 @@
.xword 0
prom_boot_mapping_phys_low:
.xword 0
+is_sun4v:
+ .word 0
1:
rd %pc, %l0
+
+ mov (1b - prom_peer_name), %l1
+ sub %l0, %l1, %l1
+ mov 0, %l2
+
+ /* prom_root_node = prom_peer(0) */
+ stx %l1, [%sp + 2047 + 128 + 0x00] ! service, "peer"
+ mov 1, %l3
+ stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 1
+ stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 1
+ stx %l2, [%sp + 2047 + 128 + 0x18] ! arg1, 0
+ stx %g0, [%sp + 2047 + 128 + 0x20] ! ret1
+ call %l7
+ add %sp, (2047 + 128), %o0 ! argument array
+
+ ldx [%sp + 2047 + 128 + 0x20], %l4 ! prom root node
+ mov (1b - prom_root_node), %l1
+ sub %l0, %l1, %l1
+ stw %l4, [%l1]
+
+ mov (1b - prom_getprop_name), %l1
+ mov (1b - prom_compatible_name), %l2
+ mov (1b - prom_root_compatible), %l5
+ sub %l0, %l1, %l1
+ sub %l0, %l2, %l2
+ sub %l0, %l5, %l5
+
+ /* prom_getproperty(prom_root_node, "compatible",
+ * &prom_root_compatible, 64)
+ */
+ stx %l1, [%sp + 2047 + 128 + 0x00] ! service, "getprop"
+ mov 4, %l3
+ stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 4
+ mov 1, %l3
+ stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 1
+ stx %l4, [%sp + 2047 + 128 + 0x18] ! arg1, prom_root_node
+ stx %l2, [%sp + 2047 + 128 + 0x20] ! arg2, "compatible"
+ stx %l5, [%sp + 2047 + 128 + 0x28] ! arg3, &prom_root_compatible
+ mov 64, %l3
+ stx %l3, [%sp + 2047 + 128 + 0x30] ! arg4, size
+ stx %g0, [%sp + 2047 + 128 + 0x38] ! ret1
+ call %l7
+ add %sp, (2047 + 128), %o0 ! argument array
+
mov (1b - prom_finddev_name), %l1
mov (1b - prom_chosen_path), %l2
mov (1b - prom_boot_mapped_pc), %l3
@@ -239,6 +296,27 @@
add %sp, (192 + 128), %sp
sparc64_boot_after_remap:
+ sethi %hi(prom_root_compatible), %g1
+ or %g1, %lo(prom_root_compatible), %g1
+ sethi %hi(prom_sun4v_name), %g7
+ or %g7, %lo(prom_sun4v_name), %g7
+ mov 10, %g3
+1: ldub [%g7], %g2
+ ldub [%g1], %g4
+ cmp %g2, %g4
+ bne,pn %icc, 2f
+ add %g7, 1, %g7
+ subcc %g3, 1, %g3
+ bne,pt %xcc, 1b
+ add %g1, 1, %g1
+
+ sethi %hi(is_sun4v), %g1
+ or %g1, %lo(is_sun4v), %g1
+ mov 1, %g7
+ stw %g7, [%g1]
+
+2:
+ BRANCH_IF_SUN4V(g1, jump_to_sun4u_init)
BRANCH_IF_CHEETAH_BASE(g1,g7,cheetah_boot)
BRANCH_IF_CHEETAH_PLUS_OR_FOLLOWON(g1,g7,cheetah_plus_boot)
ba,pt %xcc, spitfire_boot
@@ -323,14 +401,12 @@
membar #Sync
- BRANCH_IF_ANY_CHEETAH(g1,g7,cheetah_tlb_fixup)
+ BRANCH_IF_SUN4V(g1, niagara_tlb_fixup)
+ BRANCH_IF_ANY_CHEETAH(g1, g7, cheetah_tlb_fixup)
ba,pt %xcc, spitfire_tlb_fixup
nop
- /* XXX Nothing branches to here yet, when %ver register indicates
- * XXX Niagara we should do this.
- */
niagara_tlb_fixup:
mov 3, %g2 /* Set TLB type to hypervisor. */
sethi %hi(tlb_type), %g1
@@ -346,6 +422,9 @@
call hypervisor_patch_cachetlbops
nop
+ ba,pt %xcc, tlb_fixup_done
+ nop
+
cheetah_tlb_fixup:
mov 2, %g2 /* Set TLB type to cheetah+. */
BRANCH_IF_CHEETAH_PLUS_OR_FOLLOWON(g1,g7,1f)
@@ -464,7 +543,8 @@
sllx %o2, 32, %o2
wr %o2, 0, %tick_cmpr
- BRANCH_IF_ANY_CHEETAH(o2,o3,1f)
+ BRANCH_IF_SUN4V(o2, 1f)
+ BRANCH_IF_ANY_CHEETAH(o2, o3, 1f)
ba,pt %xcc, 2f
nop
