[SPARC64]: Deal with PTE layout differences in SUN4V.
Yes, you heard it right, they changed the PTE layout for SUN4V. Ho hum... This is the simple and inefficient way to support this. It'll get optimized, don't worry. Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
@@ -64,12 +64,6 @@ struct screen_info screen_info = {
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16 /* orig-video-points */
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};
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/* Typing sync at the prom prompt calls the function pointed to by
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* the sync callback which I set to the following function.
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* This should sync all filesystems and return, for now it just
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* prints out pretty messages and returns.
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*/
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void (*prom_palette)(int);
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void (*prom_keyboard)(void);
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@@ -79,263 +73,6 @@ prom_console_write(struct console *con, const char *s, unsigned n)
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prom_write(s, n);
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}
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static struct console prom_console = {
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.name = "prom",
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.write = prom_console_write,
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.flags = CON_CONSDEV | CON_ENABLED,
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.index = -1,
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};
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#define PROM_TRUE -1
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#define PROM_FALSE 0
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/* Pretty sick eh? */
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int prom_callback(long *args)
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{
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struct console *cons, *saved_console = NULL;
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unsigned long flags;
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char *cmd;
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extern spinlock_t prom_entry_lock;
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if (!args)
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return -1;
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if (!(cmd = (char *)args[0]))
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return -1;
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/*
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* The callback can be invoked on the cpu that first dropped
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* into prom_cmdline after taking the serial interrupt, or on
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* a slave processor that was smp_captured() if the
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* administrator has done a switch-cpu inside obp. In either
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* case, the cpu is marked as in-interrupt. Drop IRQ locks.
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*/
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irq_exit();
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/* XXX Revisit the locking here someday. This is a debugging
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* XXX feature so it isnt all that critical. -DaveM
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*/
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local_irq_save(flags);
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spin_unlock(&prom_entry_lock);
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cons = console_drivers;
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while (cons) {
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unregister_console(cons);
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cons->flags &= ~(CON_PRINTBUFFER);
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cons->next = saved_console;
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saved_console = cons;
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cons = console_drivers;
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}
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register_console(&prom_console);
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if (!strcmp(cmd, "sync")) {
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prom_printf("PROM `%s' command...\n", cmd);
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show_free_areas();
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if (current->pid != 0) {
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local_irq_enable();
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sys_sync();
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local_irq_disable();
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}
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args[2] = 0;
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args[args[1] + 3] = -1;
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prom_printf("Returning to PROM\n");
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} else if (!strcmp(cmd, "va>tte-data")) {
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unsigned long ctx, va;
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unsigned long tte = 0;
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long res = PROM_FALSE;
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ctx = args[3];
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va = args[4];
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if (ctx) {
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/*
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* Find process owning ctx, lookup mapping.
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*/
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struct task_struct *p;
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struct mm_struct *mm = NULL;
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pgd_t *pgdp;
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pud_t *pudp;
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pmd_t *pmdp;
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pte_t *ptep;
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pte_t pte;
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for_each_process(p) {
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mm = p->mm;
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if (CTX_NRBITS(mm->context) == ctx)
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break;
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}
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if (!mm ||
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CTX_NRBITS(mm->context) != ctx)
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goto done;
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pgdp = pgd_offset(mm, va);
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if (pgd_none(*pgdp))
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goto done;
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pudp = pud_offset(pgdp, va);
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if (pud_none(*pudp))
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goto done;
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pmdp = pmd_offset(pudp, va);
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if (pmd_none(*pmdp))
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goto done;
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/* Preemption implicitly disabled by virtue of
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* being called from inside OBP.
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*/
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ptep = pte_offset_map(pmdp, va);
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pte = *ptep;
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if (pte_present(pte)) {
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tte = pte_val(pte);
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res = PROM_TRUE;
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}
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pte_unmap(ptep);
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goto done;
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}
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if ((va >= KERNBASE) && (va < (KERNBASE + (4 * 1024 * 1024)))) {
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if (tlb_type == spitfire) {
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extern unsigned long sparc64_kern_pri_context;
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/* Spitfire Errata #32 workaround */
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__asm__ __volatile__(
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"stxa %0, [%1] %2\n\t"
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"flush %%g6"
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: /* No outputs */
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: "r" (sparc64_kern_pri_context),
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"r" (PRIMARY_CONTEXT),
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"i" (ASI_DMMU));
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}
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/*
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* Locked down tlb entry.
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*/
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if (tlb_type == spitfire) {
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tte = spitfire_get_dtlb_data(SPITFIRE_HIGHEST_LOCKED_TLBENT);
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res = PROM_TRUE;
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} else if (tlb_type == cheetah || tlb_type == cheetah_plus) {
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tte = cheetah_get_ldtlb_data(CHEETAH_HIGHEST_LOCKED_TLBENT);
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res = PROM_TRUE;
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}
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goto done;
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}
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if (va < PGDIR_SIZE) {
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/*
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* vmalloc or prom_inherited mapping.
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*/
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pgd_t *pgdp;
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pud_t *pudp;
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pmd_t *pmdp;
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pte_t *ptep;
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pte_t pte;
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int error;
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if ((va >= LOW_OBP_ADDRESS) && (va < HI_OBP_ADDRESS)) {
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tte = prom_virt_to_phys(va, &error);
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if (!error)
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res = PROM_TRUE;
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goto done;
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}
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pgdp = pgd_offset_k(va);
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if (pgd_none(*pgdp))
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goto done;
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pudp = pud_offset(pgdp, va);
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if (pud_none(*pudp))
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goto done;
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pmdp = pmd_offset(pudp, va);
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if (pmd_none(*pmdp))
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goto done;
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/* Preemption implicitly disabled by virtue of
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* being called from inside OBP.
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*/
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ptep = pte_offset_kernel(pmdp, va);
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pte = *ptep;
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if (pte_present(pte)) {
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tte = pte_val(pte);
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res = PROM_TRUE;
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}
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goto done;
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}
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if (va < PAGE_OFFSET) {
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/*
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* No mappings here.
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*/
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goto done;
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}
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if (va & (1UL << 40)) {
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/*
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* I/O page.
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*/
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tte = (__pa(va) & _PAGE_PADDR) |
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_PAGE_VALID | _PAGE_SZ4MB |
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_PAGE_E | _PAGE_P | _PAGE_W;
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res = PROM_TRUE;
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goto done;
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}
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/*
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* Normal page.
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*/
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tte = (__pa(va) & _PAGE_PADDR) |
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_PAGE_VALID | _PAGE_SZ4MB |
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_PAGE_CP | _PAGE_CV | _PAGE_P | _PAGE_W;
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res = PROM_TRUE;
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done:
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if (res == PROM_TRUE) {
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args[2] = 3;
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args[args[1] + 3] = 0;
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args[args[1] + 4] = res;
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args[args[1] + 5] = tte;
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} else {
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args[2] = 2;
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args[args[1] + 3] = 0;
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args[args[1] + 4] = res;
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}
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} else if (!strcmp(cmd, ".soft1")) {
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unsigned long tte;
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tte = args[3];
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prom_printf("%lx:\"%s%s%s%s%s\" ",
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(tte & _PAGE_SOFT) >> 7,
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tte & _PAGE_MODIFIED ? "M" : "-",
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tte & _PAGE_ACCESSED ? "A" : "-",
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tte & _PAGE_READ ? "W" : "-",
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tte & _PAGE_WRITE ? "R" : "-",
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tte & _PAGE_PRESENT ? "P" : "-");
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args[2] = 2;
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args[args[1] + 3] = 0;
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args[args[1] + 4] = PROM_TRUE;
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} else if (!strcmp(cmd, ".soft2")) {
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unsigned long tte;
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tte = args[3];
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prom_printf("%lx ", (tte & 0x07FC000000000000UL) >> 50);
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args[2] = 2;
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args[args[1] + 3] = 0;
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args[args[1] + 4] = PROM_TRUE;
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} else {
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prom_printf("unknown PROM `%s' command...\n", cmd);
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}
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unregister_console(&prom_console);
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while (saved_console) {
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cons = saved_console;
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saved_console = cons->next;
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register_console(cons);
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}
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spin_lock(&prom_entry_lock);
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local_irq_restore(flags);
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/*
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* Restore in-interrupt status for a resume from obp.
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*/
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irq_enter();
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return 0;
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}
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unsigned int boot_flags = 0;
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#define BOOTME_DEBUG 0x1
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#define BOOTME_SINGLE 0x2
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@@ -483,17 +220,6 @@ char reboot_command[COMMAND_LINE_SIZE];
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static struct pt_regs fake_swapper_regs = { { 0, }, 0, 0, 0, 0 };
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void register_prom_callbacks(void)
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{
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prom_setcallback(prom_callback);
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prom_feval(": linux-va>tte-data 2 \" va>tte-data\" $callback drop ; "
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"' linux-va>tte-data to va>tte-data");
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prom_feval(": linux-.soft1 1 \" .soft1\" $callback 2drop ; "
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"' linux-.soft1 to .soft1");
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prom_feval(": linux-.soft2 1 \" .soft2\" $callback 2drop ; "
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"' linux-.soft2 to .soft2");
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}
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static void __init per_cpu_patch(void)
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{
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#ifdef CONFIG_SMP
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