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Commit aac372de authored by Linus Torvalds's avatar Linus Torvalds
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Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/sparc-2.6

parents 02d31ed2 c9c10830
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Showing with 166 additions and 226 deletions
arch/sparc64/kernel/dtlb_base.S
View file @ aac372de
......@@ -53,19 +53,18 @@
* be guaranteed to be 0 ... mmu_context.h does guarantee this
* by only using 10 bits in the hwcontext value.
*/
#define CREATE_VPTE_OFFSET1(r1, r2)
#define CREATE_VPTE_OFFSET1(r1, r2) nop
#define CREATE_VPTE_OFFSET2(r1, r2) \
srax r1, 10, r2
#define CREATE_VPTE_NOP nop
#else
#define CREATE_VPTE_OFFSET1(r1, r2) \
srax r1, PAGE_SHIFT, r2
#define CREATE_VPTE_OFFSET2(r1, r2) \
sllx r2, 3, r2
#define CREATE_VPTE_NOP
#endif
/* DTLB ** ICACHE line 1: Quick user TLB misses */
mov TLB_SFSR, %g1
ldxa [%g1 + %g1] ASI_DMMU, %g4 ! Get TAG_ACCESS
andcc %g4, TAG_CONTEXT_BITS, %g0 ! From Nucleus?
from_tl1_trap:
......@@ -74,18 +73,16 @@ from_tl1_trap:
be,pn %xcc, kvmap ! Yep, special processing
CREATE_VPTE_OFFSET2(%g4, %g6) ! Create VPTE offset
cmp %g5, 4 ! Last trap level?
be,pn %xcc, longpath ! Yep, cannot risk VPTE miss
nop ! delay slot
/* DTLB ** ICACHE line 2: User finish + quick kernel TLB misses */
be,pn %xcc, longpath ! Yep, cannot risk VPTE miss
nop ! delay slot
ldxa [%g3 + %g6] ASI_S, %g5 ! Load VPTE
1: brgez,pn %g5, longpath ! Invalid, branch out
nop ! Delay-slot
9: stxa %g5, [%g0] ASI_DTLB_DATA_IN ! Reload TLB
retry ! Trap return
nop
nop
nop
/* DTLB ** ICACHE line 3: winfixups+real_faults */
longpath:
......@@ -106,8 +103,7 @@ longpath:
nop
nop
nop
CREATE_VPTE_NOP
nop
#undef CREATE_VPTE_OFFSET1
#undef CREATE_VPTE_OFFSET2
#undef CREATE_VPTE_NOP
arch/sparc64/kernel/dtlb_prot.S
View file @ aac372de
......@@ -14,14 +14,14 @@
*/
/* PROT ** ICACHE line 1: User DTLB protection trap */
stxa %g0, [%g1] ASI_DMMU ! Clear SFSR FaultValid bit
membar #Sync ! Synchronize ASI stores
rdpr %pstate, %g5 ! Move into alternate globals
mov TLB_SFSR, %g1
stxa %g0, [%g1] ASI_DMMU ! Clear FaultValid bit
membar #Sync ! Synchronize stores
rdpr %pstate, %g5 ! Move into alt-globals
wrpr %g5, PSTATE_AG|PSTATE_MG, %pstate
rdpr %tl, %g1 ! Need to do a winfixup?
rdpr %tl, %g1 ! Need a winfixup?
cmp %g1, 1 ! Trap level >1?
mov TLB_TAG_ACCESS, %g4 ! Prepare reload of vaddr
nop
mov TLB_TAG_ACCESS, %g4 ! For reload of vaddr
/* PROT ** ICACHE line 2: More real fault processing */
bgu,pn %xcc, winfix_trampoline ! Yes, perform winfixup
......
arch/sparc64/kernel/head.S
View file @ aac372de
......@@ -28,19 +28,14 @@
#include <asm/mmu.h>
/* This section from from _start to sparc64_boot_end should fit into
* 0x0000.0000.0040.4000 to 0x0000.0000.0040.8000 and will be sharing space
* with bootup_user_stack, which is from 0x0000.0000.0040.4000 to
* 0x0000.0000.0040.6000 and empty_bad_page, which is from
* 0x0000.0000.0040.6000 to 0x0000.0000.0040.8000.
* 0x0000000000404000 to 0x0000000000408000.
*/
.text
.globl start, _start, stext, _stext
_start:
start:
_stext:
stext:
bootup_user_stack:
! 0x0000000000404000
b sparc64_boot
flushw /* Flush register file. */
......@@ -392,31 +387,30 @@ tlb_fixup_done:
* former does use this code, the latter does not yet due
* to some complexities. That should be fixed up at some
* point.
*
* There used to be enormous complexity wrt. transferring
* over from the firwmare's trap table to the Linux kernel's.
* For example, there was a chicken & egg problem wrt. building
* the OBP page tables, yet needing to be on the Linux kernel
* trap table (to translate PAGE_OFFSET addresses) in order to
* do that.
*
* We now handle OBP tlb misses differently, via linear lookups
* into the prom_trans[] array. So that specific problem no
* longer exists. Yet, unfortunately there are still some issues
* preventing trampoline.S from using this code... ho hum.
*/
.globl setup_trap_table
setup_trap_table:
save %sp, -192, %sp
/* Force interrupts to be disabled. Transferring over to
* the Linux trap table is a very delicate operation.
* Until we are actually on the Linux trap table, we cannot
* get the PAGE_OFFSET linear mappings translated. We need
* that mapping to be setup in order to initialize the firmware
* page tables.
*
* So there is this window of time, from the return from
* prom_set_trap_table() until inherit_prom_mappings_post()
* (in arch/sparc64/mm/init.c) completes, during which no
* firmware address space accesses can be made.
*/
/* Force interrupts to be disabled. */
rdpr %pstate, %o1
andn %o1, PSTATE_IE, %o1
wrpr %o1, 0x0, %pstate
wrpr %g0, 15, %pil
/* Ok, now make the final valid firmware call to jump over
* to the Linux trap table.
*/
/* Make the firmware call to jump over to the Linux trap table. */
call prom_set_trap_table
sethi %hi(sparc64_ttable_tl0), %o0
......@@ -540,15 +534,21 @@ setup_tba: /* i0 = is_starfire */
ret
restore
sparc64_boot_end:
#include "systbls.S"
#include "ktlb.S"
#include "etrap.S"
#include "rtrap.S"
#include "winfixup.S"
#include "entry.S"
/*
* The following skips make sure the trap table in ttable.S is aligned
* The following skip makes sure the trap table in ttable.S is aligned
* on a 32K boundary as required by the v9 specs for TBA register.
*/
sparc64_boot_end:
.skip 0x2000 + _start - sparc64_boot_end
bootup_user_stack_end:
.skip 0x2000
1:
.skip 0x4000 + _start - 1b
#ifdef CONFIG_SBUS
/* This is just a hack to fool make depend config.h discovering
......@@ -560,15 +560,6 @@ bootup_user_stack_end:
! 0x0000000000408000
#include "ttable.S"
#include "systbls.S"
#include "ktlb.S"
#include "etrap.S"
#include "rtrap.S"
#include "winfixup.S"
#include "entry.S"
/* This is just anal retentiveness on my part... */
.align 16384
.data
.align 8
......
arch/sparc64/kernel/itlb_base.S
View file @ aac372de
......@@ -15,14 +15,12 @@
*/
#define CREATE_VPTE_OFFSET1(r1, r2) \
srax r1, 10, r2
#define CREATE_VPTE_OFFSET2(r1, r2)
#define CREATE_VPTE_NOP nop
#define CREATE_VPTE_OFFSET2(r1, r2) nop
#else /* PAGE_SHIFT */
#define CREATE_VPTE_OFFSET1(r1, r2) \
srax r1, PAGE_SHIFT, r2
#define CREATE_VPTE_OFFSET2(r1, r2) \
sllx r2, 3, r2
#define CREATE_VPTE_NOP
#endif /* PAGE_SHIFT */
......@@ -36,6 +34,7 @@
*/
/* ITLB ** ICACHE line 1: Quick user TLB misses */
mov TLB_SFSR, %g1
ldxa [%g1 + %g1] ASI_IMMU, %g4 ! Get TAG_ACCESS
CREATE_VPTE_OFFSET1(%g4, %g6) ! Create VPTE offset
CREATE_VPTE_OFFSET2(%g4, %g6) ! Create VPTE offset
......@@ -43,41 +42,38 @@
1: brgez,pn %g5, 3f ! Not valid, branch out
sethi %hi(_PAGE_EXEC), %g4 ! Delay-slot
andcc %g5, %g4, %g0 ! Executable?
/* ITLB ** ICACHE line 2: Real faults */
be,pn %xcc, 3f ! Nope, branch.
nop ! Delay-slot
2: stxa %g5, [%g0] ASI_ITLB_DATA_IN ! Load PTE into TLB
retry ! Trap return
3: rdpr %pstate, %g4 ! Move into alternate globals
/* ITLB ** ICACHE line 2: Real faults */
3: rdpr %pstate, %g4 ! Move into alt-globals
wrpr %g4, PSTATE_AG|PSTATE_MG, %pstate
rdpr %tpc, %g5 ! And load faulting VA
mov FAULT_CODE_ITLB, %g4 ! It was read from ITLB
sparc64_realfault_common: ! Called by TL0 dtlb_miss too
/* ITLB ** ICACHE line 3: Finish faults */
sparc64_realfault_common: ! Called by dtlb_miss
stb %g4, [%g6 + TI_FAULT_CODE]
stx %g5, [%g6 + TI_FAULT_ADDR]
ba,pt %xcc, etrap ! Save state
1: rd %pc, %g7 ! ...
nop
/* ITLB ** ICACHE line 3: Finish faults + window fixups */
call do_sparc64_fault ! Call fault handler
add %sp, PTREGS_OFF, %o0! Compute pt_regs arg
ba,pt %xcc, rtrap_clr_l6 ! Restore cpu state
nop
/* ITLB ** ICACHE line 4: Window fixups */
winfix_trampoline:
rdpr %tpc, %g3 ! Prepare winfixup TNPC
or %g3, 0x7c, %g3 ! Compute offset to branch
or %g3, 0x7c, %g3 ! Compute branch offset
wrpr %g3, %tnpc ! Write it into TNPC
done ! Do it to it
/* ITLB ** ICACHE line 4: Unused... */
nop
nop
nop
nop
CREATE_VPTE_NOP
#undef CREATE_VPTE_OFFSET1
#undef CREATE_VPTE_OFFSET2
#undef CREATE_VPTE_NOP
arch/sparc64/kernel/ktlb.S
View file @ aac372de
......@@ -58,9 +58,6 @@ vpte_noent:
done
vpte_insn_obp:
sethi %hi(prom_pmd_phys), %g5
ldx [%g5 + %lo(prom_pmd_phys)], %g5
/* Behave as if we are at TL0. */
wrpr %g0, 1, %tl
rdpr %tpc, %g4 /* Find original faulting iaddr */
......@@ -71,58 +68,57 @@ vpte_insn_obp:
mov TLB_SFSR, %g1
stxa %g4, [%g1 + %g1] ASI_IMMU
/* Get PMD offset. */
srlx %g4, 23, %g6
and %g6, 0x7ff, %g6
sllx %g6, 2, %g6
/* Load PMD, is it valid? */
lduwa [%g5 + %g6] ASI_PHYS_USE_EC, %g5
brz,pn %g5, longpath
sllx %g5, 11, %g5
/* Get PTE offset. */
srlx %g4, 13, %g6
and %g6, 0x3ff, %g6
sllx %g6, 3, %g6
/* Load PTE. */
ldxa [%g5 + %g6] ASI_PHYS_USE_EC, %g5
brgez,pn %g5, longpath
nop
/* TLB load and return from trap. */
sethi %hi(prom_trans), %g5
or %g5, %lo(prom_trans), %g5
1: ldx [%g5 + 0x00], %g6 ! base
brz,a,pn %g6, longpath ! no more entries, fail
mov TLB_SFSR, %g1 ! and restore %g1
ldx [%g5 + 0x08], %g1 ! len
add %g6, %g1, %g1 ! end
cmp %g6, %g4
bgu,pt %xcc, 2f
cmp %g4, %g1
bgeu,pt %xcc, 2f
ldx [%g5 + 0x10], %g1 ! PTE
/* TLB load, restore %g1, and return from trap. */
sub %g4, %g6, %g6
add %g1, %g6, %g5
mov TLB_SFSR, %g1
stxa %g5, [%g0] ASI_ITLB_DATA_IN
retry
kvmap_do_obp:
sethi %hi(prom_pmd_phys), %g5
ldx [%g5 + %lo(prom_pmd_phys)], %g5
/* Get PMD offset. */
srlx %g4, 23, %g6
and %g6, 0x7ff, %g6
sllx %g6, 2, %g6
2: ba,pt %xcc, 1b
add %g5, (3 * 8), %g5 ! next entry
/* Load PMD, is it valid? */
lduwa [%g5 + %g6] ASI_PHYS_USE_EC, %g5
brz,pn %g5, longpath
sllx %g5, 11, %g5
/* Get PTE offset. */
srlx %g4, 13, %g6
and %g6, 0x3ff, %g6
sllx %g6, 3, %g6
/* Load PTE. */
ldxa [%g5 + %g6] ASI_PHYS_USE_EC, %g5
brgez,pn %g5, longpath
nop
/* TLB load and return from trap. */
kvmap_do_obp:
sethi %hi(prom_trans), %g5
or %g5, %lo(prom_trans), %g5
srlx %g4, 13, %g4
sllx %g4, 13, %g4
1: ldx [%g5 + 0x00], %g6 ! base
brz,a,pn %g6, longpath ! no more entries, fail
mov TLB_SFSR, %g1 ! and restore %g1
ldx [%g5 + 0x08], %g1 ! len
add %g6, %g1, %g1 ! end
cmp %g6, %g4
bgu,pt %xcc, 2f
cmp %g4, %g1
bgeu,pt %xcc, 2f
ldx [%g5 + 0x10], %g1 ! PTE
/* TLB load, restore %g1, and return from trap. */
sub %g4, %g6, %g6
add %g1, %g6, %g5
mov TLB_SFSR, %g1
stxa %g5, [%g0] ASI_DTLB_DATA_IN
retry
2: ba,pt %xcc, 1b
add %g5, (3 * 8), %g5 ! next entry
/*
* On a first level data miss, check whether this is to the OBP range (note
* that such accesses can be made by prom, as well as by kernel using
......
arch/sparc64/mm/init.c
View file @ aac372de
......@@ -367,8 +367,11 @@ struct linux_prom_translation {
unsigned long size;
unsigned long data;
};
static struct linux_prom_translation prom_trans[512] __initdata;
static unsigned int prom_trans_ents __initdata;
/* Exported for kernel TLB miss handling in ktlb.S */
struct linux_prom_translation prom_trans[512] __read_mostly;
unsigned int prom_trans_ents __read_mostly;
unsigned int swapper_pgd_zero __read_mostly;
extern unsigned long prom_boot_page;
extern void prom_remap(unsigned long physpage, unsigned long virtpage, int mmu_ihandle);
......@@ -378,122 +381,57 @@ extern void register_prom_callbacks(void);
/* Exported for SMP bootup purposes. */
unsigned long kern_locked_tte_data;
/* Exported for kernel TLB miss handling in ktlb.S */
unsigned long prom_pmd_phys __read_mostly;
unsigned int swapper_pgd_zero __read_mostly;
static pmd_t *prompmd __read_mostly;
#define BASE_PAGE_SIZE 8192
/*
* Translate PROM's mapping we capture at boot time into physical address.
* The second parameter is only set from prom_callback() invocations.
*/
unsigned long prom_virt_to_phys(unsigned long promva, int *error)
{
pmd_t *pmdp = prompmd + ((promva >> 23) & 0x7ff);
pte_t *ptep;
unsigned long base;
int i;
for (i = 0; i < prom_trans_ents; i++) {
struct linux_prom_translation *p = &prom_trans[i];
if (promva >= p->virt &&
promva < (p->virt + p->size)) {
unsigned long base = p->data & _PAGE_PADDR;
if (pmd_none(*pmdp)) {
if (error)
*error = 1;
return 0;
*error = 0;
return base + (promva & (8192 - 1));
}
}
ptep = (pte_t *)__pmd_page(*pmdp) + ((promva >> 13) & 0x3ff);
if (!pte_present(*ptep)) {
if (error)
*error = 1;
return 0;
}
if (error) {
*error = 0;
return pte_val(*ptep);
}
base = pte_val(*ptep) & _PAGE_PADDR;
return base + (promva & (BASE_PAGE_SIZE - 1));
return 0UL;
}
/* The obp translations are saved based on 8k pagesize, since obp can
* use a mixture of pagesizes. Misses to the LOW_OBP_ADDRESS ->
* HI_OBP_ADDRESS range are handled in entry.S and do not use the vpte
* HI_OBP_ADDRESS range are handled in ktlb.S and do not use the vpte
* scheme (also, see rant in inherit_locked_prom_mappings()).
*/
static void __init build_obp_range(unsigned long start, unsigned long end, unsigned long data)
{
unsigned long vaddr;
for (vaddr = start; vaddr < end; vaddr += BASE_PAGE_SIZE) {
unsigned long val;
pmd_t *pmd;
pte_t *pte;
pmd = prompmd + ((vaddr >> 23) & 0x7ff);
if (pmd_none(*pmd)) {
pte = __alloc_bootmem(BASE_PAGE_SIZE, BASE_PAGE_SIZE,
PAGE_SIZE);
if (!pte)
prom_halt();
memset(pte, 0, BASE_PAGE_SIZE);
pmd_set(pmd, pte);
}
pte = (pte_t *) __pmd_page(*pmd) + ((vaddr >> 13) & 0x3ff);
val = data;
/* Clear diag TTE bits. */
if (tlb_type == spitfire)
val &= ~0x0003fe0000000000UL;
set_pte_at(&init_mm, vaddr, pte,
__pte(val | _PAGE_MODIFIED));
data += BASE_PAGE_SIZE;
}
}
static inline int in_obp_range(unsigned long vaddr)
{
return (vaddr >= LOW_OBP_ADDRESS &&
vaddr < HI_OBP_ADDRESS);
}
#define OBP_PMD_SIZE 2048
static void __init build_obp_pgtable(void)
static int cmp_ptrans(const void *a, const void *b)
{
unsigned long i;
prompmd = __alloc_bootmem(OBP_PMD_SIZE, OBP_PMD_SIZE, PAGE_SIZE);
if (!prompmd)
prom_halt();
memset(prompmd, 0, OBP_PMD_SIZE);
prom_pmd_phys = __pa(prompmd);
const struct linux_prom_translation *x = a, *y = b;
for (i = 0; i < prom_trans_ents; i++) {
unsigned long start, end;
if (!in_obp_range(prom_trans[i].virt))
continue;
start = prom_trans[i].virt;
end = start + prom_trans[i].size;
if (end > HI_OBP_ADDRESS)
end = HI_OBP_ADDRESS;
build_obp_range(start, end, prom_trans[i].data);
}
if (x->virt > y->virt)
return 1;
if (x->virt < y->virt)
return -1;
return 0;
}
/* Read OBP translations property into 'prom_trans[]'.
* Return the number of entries.
*/
/* Read OBP translations property into 'prom_trans[]'. */
static void __init read_obp_translations(void)
{
int n, node;
int n, node, ents, first, last, i;
node = prom_finddevice("/virtual-memory");
n = prom_getproplen(node, "translations");
......@@ -515,7 +453,41 @@ static void __init read_obp_translations(void)
n = n / sizeof(struct linux_prom_translation);
prom_trans_ents = n;
ents = n;
sort(prom_trans, ents, sizeof(struct linux_prom_translation),
cmp_ptrans, NULL);
/* Now kick out all the non-OBP entries. */
for (i = 0; i < ents; i++) {
if (in_obp_range(prom_trans[i].virt))
break;
}
first = i;
for (; i < ents; i++) {
if (!in_obp_range(prom_trans[i].virt))
break;
}
last = i;
for (i = 0; i < (last - first); i++) {
struct linux_prom_translation *src = &prom_trans[i + first];
struct linux_prom_translation *dest = &prom_trans[i];
*dest = *src;
}
for (; i < ents; i++) {
struct linux_prom_translation *dest = &prom_trans[i];
dest->virt = dest->size = dest->data = 0x0UL;
}
prom_trans_ents = last - first;
if (tlb_type == spitfire) {
/* Clear diag TTE bits. */
for (i = 0; i < prom_trans_ents; i++)
prom_trans[i].data &= ~0x0003fe0000000000UL;
}
}
static void __init remap_kernel(void)
......@@ -553,21 +525,18 @@ static void __init remap_kernel(void)
}
static void __init inherit_prom_mappings_pre(void)
static void __init inherit_prom_mappings(void)
{
read_obp_translations();
/* Now fixup OBP's idea about where we really are mapped. */
prom_printf("Remapping the kernel... ");
remap_kernel();
prom_printf("done.\n");
}
static void __init inherit_prom_mappings_post(void)
{
build_obp_pgtable();
prom_printf("Registering callbacks... ");
register_prom_callbacks();
prom_printf("done.\n");
}
/* The OBP specifications for sun4u mark 0xfffffffc00000000 and
......@@ -1519,7 +1488,7 @@ void __init paging_init(void)
swapper_pgd_zero = pgd_val(swapper_pg_dir[0]);
inherit_prom_mappings_pre();
inherit_prom_mappings();
/* Ok, we can use our TLB miss and window trap handlers safely.
* We need to do a quick peek here to see if we are on StarFire
......@@ -1530,23 +1499,15 @@ void __init paging_init(void)
extern void setup_tba(int);
setup_tba(this_is_starfire);
}
__flush_tlb_all();
/* Everything from this point forward, until we are done with
* inherit_prom_mappings_post(), must complete successfully
* without calling into the firmware. The firwmare page tables
* have not been built, but we are running on the Linux kernel's
* trap table.
*/
inherit_locked_prom_mappings(1);
__flush_tlb_all();
/* Setup bootmem... */
pages_avail = 0;
last_valid_pfn = end_pfn = bootmem_init(&pages_avail);
inherit_prom_mappings_post();
inherit_locked_prom_mappings(1);
#ifdef CONFIG_DEBUG_PAGEALLOC
kernel_physical_mapping_init();
#endif
......
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