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Diffstat (limited to 'arch/sparc64/kernel/head.S')
| -rw-r--r-- | arch/sparc64/kernel/head.S | 782 |
1 files changed, 782 insertions, 0 deletions
diff --git a/arch/sparc64/kernel/head.S b/arch/sparc64/kernel/head.S new file mode 100644 index 000000000000..8104a56ca2d8 --- /dev/null +++ b/arch/sparc64/kernel/head.S @@ -0,0 +1,782 @@ +/* $Id: head.S,v 1.87 2002/02/09 19:49:31 davem Exp $ + * head.S: Initial boot code for the Sparc64 port of Linux. + * + * Copyright (C) 1996,1997 David S. Miller (davem@caip.rutgers.edu) + * Copyright (C) 1996 David Sitsky (David.Sitsky@anu.edu.au) + * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) + * Copyright (C) 1997 Miguel de Icaza (miguel@nuclecu.unam.mx) + */ + +#include <linux/config.h> +#include <linux/version.h> +#include <linux/errno.h> +#include <asm/thread_info.h> +#include <asm/asi.h> +#include <asm/pstate.h> +#include <asm/ptrace.h> +#include <asm/spitfire.h> +#include <asm/page.h> +#include <asm/pgtable.h> +#include <asm/errno.h> +#include <asm/signal.h> +#include <asm/processor.h> +#include <asm/lsu.h> +#include <asm/dcr.h> +#include <asm/dcu.h> +#include <asm/head.h> +#include <asm/ttable.h> +#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. + */ + + .text + .globl start, _start, stext, _stext +_start: +start: +_stext: +stext: +bootup_user_stack: +! 0x0000000000404000 + b sparc64_boot + flushw /* Flush register file. */ + +/* This stuff has to be in sync with SILO and other potential boot loaders + * Fields should be kept upward compatible and whenever any change is made, + * HdrS version should be incremented. + */ + .global root_flags, ram_flags, root_dev + .global sparc_ramdisk_image, sparc_ramdisk_size + .global sparc_ramdisk_image64 + + .ascii "HdrS" + .word LINUX_VERSION_CODE + + /* History: + * + * 0x0300 : Supports being located at other than 0x4000 + * 0x0202 : Supports kernel params string + * 0x0201 : Supports reboot_command + */ + .half 0x0301 /* HdrS version */ + +root_flags: + .half 1 +root_dev: + .half 0 +ram_flags: + .half 0 +sparc_ramdisk_image: + .word 0 +sparc_ramdisk_size: + .word 0 + .xword reboot_command + .xword bootstr_info +sparc_ramdisk_image64: + .xword 0 + .word _end + + /* We must be careful, 32-bit OpenBOOT will get confused if it + * tries to save away a register window to a 64-bit kernel + * stack address. Flush all windows, disable interrupts, + * remap if necessary, jump onto kernel trap table, then kernel + * stack, or else we die. + * + * PROM entry point is on %o4 + */ +sparc64_boot: + BRANCH_IF_CHEETAH_BASE(g1,g7,cheetah_boot) + BRANCH_IF_CHEETAH_PLUS_OR_FOLLOWON(g1,g7,cheetah_plus_boot) + ba,pt %xcc, spitfire_boot + nop + +cheetah_plus_boot: + /* Preserve OBP chosen DCU and DCR register settings. */ + ba,pt %xcc, cheetah_generic_boot + nop + +cheetah_boot: + mov DCR_BPE | DCR_RPE | DCR_SI | DCR_IFPOE | DCR_MS, %g1 + wr %g1, %asr18 + + sethi %uhi(DCU_ME|DCU_RE|DCU_HPE|DCU_SPE|DCU_SL|DCU_WE), %g7 + or %g7, %ulo(DCU_ME|DCU_RE|DCU_HPE|DCU_SPE|DCU_SL|DCU_WE), %g7 + sllx %g7, 32, %g7 + or %g7, DCU_DM | DCU_IM | DCU_DC | DCU_IC, %g7 + stxa %g7, [%g0] ASI_DCU_CONTROL_REG + membar #Sync + +cheetah_generic_boot: + mov TSB_EXTENSION_P, %g3 + stxa %g0, [%g3] ASI_DMMU + stxa %g0, [%g3] ASI_IMMU + membar #Sync + + mov TSB_EXTENSION_S, %g3 + stxa %g0, [%g3] ASI_DMMU + membar #Sync + + mov TSB_EXTENSION_N, %g3 + stxa %g0, [%g3] ASI_DMMU + stxa %g0, [%g3] ASI_IMMU + membar #Sync + + wrpr %g0, (PSTATE_PRIV|PSTATE_PEF|PSTATE_IE), %pstate + wr %g0, 0, %fprs + + /* Just like for Spitfire, we probe itlb-2 for a mapping which + * matches our current %pc. We take the physical address in + * that mapping and use it to make our own. + */ + + /* %g5 holds the tlb data */ + sethi %uhi(_PAGE_VALID | _PAGE_SZ4MB), %g5 + sllx %g5, 32, %g5 + or %g5, (_PAGE_CP | _PAGE_CV | _PAGE_P | _PAGE_L | _PAGE_W | _PAGE_G), %g5 + + /* Put PADDR tlb data mask into %g3. */ + sethi %uhi(_PAGE_PADDR), %g3 + or %g3, %ulo(_PAGE_PADDR), %g3 + sllx %g3, 32, %g3 + sethi %hi(_PAGE_PADDR), %g7 + or %g7, %lo(_PAGE_PADDR), %g7 + or %g3, %g7, %g3 + + set 2 << 16, %l0 /* TLB entry walker. */ + set 0x1fff, %l2 /* Page mask. */ + rd %pc, %l3 + andn %l3, %l2, %g2 /* vaddr comparator */ + +1: ldxa [%l0] ASI_ITLB_TAG_READ, %g1 + membar #Sync + andn %g1, %l2, %g1 + cmp %g1, %g2 + be,pn %xcc, cheetah_got_tlbentry + nop + and %l0, (127 << 3), %g1 + cmp %g1, (127 << 3) + blu,pt %xcc, 1b + add %l0, (1 << 3), %l0 + + /* Search the small TLB. OBP never maps us like that but + * newer SILO can. + */ + clr %l0 + +1: ldxa [%l0] ASI_ITLB_TAG_READ, %g1 + membar #Sync + andn %g1, %l2, %g1 + cmp %g1, %g2 + be,pn %xcc, cheetah_got_tlbentry + nop + cmp %l0, (15 << 3) + blu,pt %xcc, 1b + add %l0, (1 << 3), %l0 + + /* BUG() if we get here... */ + ta 0x5 + +cheetah_got_tlbentry: + ldxa [%l0] ASI_ITLB_DATA_ACCESS, %g0 + ldxa [%l0] ASI_ITLB_DATA_ACCESS, %g1 + membar #Sync + and %g1, %g3, %g1 + set 0x5fff, %l0 + andn %g1, %l0, %g1 + or %g5, %g1, %g5 + + /* Clear out any KERNBASE area entries. */ + set 2 << 16, %l0 + sethi %hi(KERNBASE), %g3 + sethi %hi(KERNBASE<<1), %g7 + mov TLB_TAG_ACCESS, %l7 + + /* First, check ITLB */ +1: ldxa [%l0] ASI_ITLB_TAG_READ, %g1 + membar #Sync + andn %g1, %l2, %g1 + cmp %g1, %g3 + blu,pn %xcc, 2f + cmp %g1, %g7 + bgeu,pn %xcc, 2f + nop + stxa %g0, [%l7] ASI_IMMU + membar #Sync + stxa %g0, [%l0] ASI_ITLB_DATA_ACCESS + membar #Sync + +2: and %l0, (127 << 3), %g1 + cmp %g1, (127 << 3) + blu,pt %xcc, 1b + add %l0, (1 << 3), %l0 + + /* Next, check DTLB */ + set 2 << 16, %l0 +1: ldxa [%l0] ASI_DTLB_TAG_READ, %g1 + membar #Sync + andn %g1, %l2, %g1 + cmp %g1, %g3 + blu,pn %xcc, 2f + cmp %g1, %g7 + bgeu,pn %xcc, 2f + nop + stxa %g0, [%l7] ASI_DMMU + membar #Sync + stxa %g0, [%l0] ASI_DTLB_DATA_ACCESS + membar #Sync + +2: and %l0, (511 << 3), %g1 + cmp %g1, (511 << 3) + blu,pt %xcc, 1b + add %l0, (1 << 3), %l0 + + /* On Cheetah+, have to check second DTLB. */ + BRANCH_IF_CHEETAH_PLUS_OR_FOLLOWON(g1,l0,2f) + ba,pt %xcc, 9f + nop + +2: set 3 << 16, %l0 +1: ldxa [%l0] ASI_DTLB_TAG_READ, %g1 + membar #Sync + andn %g1, %l2, %g1 + cmp %g1, %g3 + blu,pn %xcc, 2f + cmp %g1, %g7 + bgeu,pn %xcc, 2f + nop + stxa %g0, [%l7] ASI_DMMU + membar #Sync + stxa %g0, [%l0] ASI_DTLB_DATA_ACCESS + membar #Sync + +2: and %l0, (511 << 3), %g1 + cmp %g1, (511 << 3) + blu,pt %xcc, 1b + add %l0, (1 << 3), %l0 + +9: + + /* Now lock the TTE we created into ITLB-0 and DTLB-0, + * entry 15 (and maybe 14 too). + */ + sethi %hi(KERNBASE), %g3 + set (0 << 16) | (15 << 3), %g7 + stxa %g3, [%l7] ASI_DMMU + membar #Sync + stxa %g5, [%g7] ASI_DTLB_DATA_ACCESS + membar #Sync + stxa %g3, [%l7] ASI_IMMU + membar #Sync + stxa %g5, [%g7] ASI_ITLB_DATA_ACCESS + membar #Sync + flush %g3 + membar #Sync + sethi %hi(_end), %g3 /* Check for bigkernel case */ + or %g3, %lo(_end), %g3 + srl %g3, 23, %g3 /* Check if _end > 8M */ + brz,pt %g3, 1f + sethi %hi(KERNBASE), %g3 /* Restore for fixup code below */ + sethi %hi(0x400000), %g3 + or %g3, %lo(0x400000), %g3 + add %g5, %g3, %g5 /* New tte data */ + andn %g5, (_PAGE_G), %g5 + sethi %hi(KERNBASE+0x400000), %g3 + or %g3, %lo(KERNBASE+0x400000), %g3 + set (0 << 16) | (14 << 3), %g7 + stxa %g3, [%l7] ASI_DMMU + membar #Sync + stxa %g5, [%g7] ASI_DTLB_DATA_ACCESS + membar #Sync + stxa %g3, [%l7] ASI_IMMU + membar #Sync + stxa %g5, [%g7] ASI_ITLB_DATA_ACCESS + membar #Sync + flush %g3 + membar #Sync + sethi %hi(KERNBASE), %g3 /* Restore for fixup code below */ + ba,pt %xcc, 1f + nop + +1: set sun4u_init, %g2 + jmpl %g2 + %g0, %g0 + nop + +spitfire_boot: + /* Typically PROM has already enabled both MMU's and both on-chip + * caches, but we do it here anyway just to be paranoid. + */ + mov (LSU_CONTROL_IC|LSU_CONTROL_DC|LSU_CONTROL_IM|LSU_CONTROL_DM), %g1 + stxa %g1, [%g0] ASI_LSU_CONTROL + membar #Sync + + /* + * Make sure we are in privileged mode, have address masking, + * using the ordinary globals and have enabled floating + * point. + * + * Again, typically PROM has left %pil at 13 or similar, and + * (PSTATE_PRIV | PSTATE_PEF | PSTATE_IE) in %pstate. + */ + wrpr %g0, (PSTATE_PRIV|PSTATE_PEF|PSTATE_IE), %pstate + wr %g0, 0, %fprs + +spitfire_create_mappings: + /* %g5 holds the tlb data */ + sethi %uhi(_PAGE_VALID | _PAGE_SZ4MB), %g5 + sllx %g5, 32, %g5 + or %g5, (_PAGE_CP | _PAGE_CV | _PAGE_P | _PAGE_L | _PAGE_W | _PAGE_G), %g5 + + /* Base of physical memory cannot reliably be assumed to be + * at 0x0! Figure out where it happens to be. -DaveM + */ + + /* Put PADDR tlb data mask into %g3. */ + sethi %uhi(_PAGE_PADDR_SF), %g3 + or %g3, %ulo(_PAGE_PADDR_SF), %g3 + sllx %g3, 32, %g3 + sethi %hi(_PAGE_PADDR_SF), %g7 + or %g7, %lo(_PAGE_PADDR_SF), %g7 + or %g3, %g7, %g3 + + /* Walk through entire ITLB, looking for entry which maps + * our %pc currently, stick PADDR from there into %g5 tlb data. + */ + clr %l0 /* TLB entry walker. */ + set 0x1fff, %l2 /* Page mask. */ + rd %pc, %l3 + andn %l3, %l2, %g2 /* vaddr comparator */ +1: + /* Yes, the nops seem to be necessary for now, don't ask me why. -DaveM */ + ldxa [%l0] ASI_ITLB_TAG_READ, %g1 + nop + nop + nop + andn %g1, %l2, %g1 /* Get vaddr */ + cmp %g1, %g2 + be,a,pn %xcc, spitfire_got_tlbentry + ldxa [%l0] ASI_ITLB_DATA_ACCESS, %g1 + cmp %l0, (63 << 3) + blu,pt %xcc, 1b + add %l0, (1 << 3), %l0 + + /* BUG() if we get here... */ + ta 0x5 + +spitfire_got_tlbentry: + /* Nops here again, perhaps Cheetah/Blackbird are better behaved... */ + nop + nop + nop + and %g1, %g3, %g1 /* Mask to just get paddr bits. */ + set 0x5fff, %l3 /* Mask offset to get phys base. */ + andn %g1, %l3, %g1 + + /* NOTE: We hold on to %g1 paddr base as we need it below to lock + * NOTE: the PROM cif code into the TLB. + */ + + or %g5, %g1, %g5 /* Or it into TAG being built. */ + + clr %l0 /* TLB entry walker. */ + sethi %hi(KERNBASE), %g3 /* 4M lower limit */ + sethi %hi(KERNBASE<<1), %g7 /* 8M upper limit */ + mov TLB_TAG_ACCESS, %l7 +1: + /* Yes, the nops seem to be necessary for now, don't ask me why. -DaveM */ + ldxa [%l0] ASI_ITLB_TAG_READ, %g1 + nop + nop + nop + andn %g1, %l2, %g1 /* Get vaddr */ + cmp %g1, %g3 + blu,pn %xcc, 2f + cmp %g1, %g7 + bgeu,pn %xcc, 2f + nop + stxa %g0, [%l7] ASI_IMMU + stxa %g0, [%l0] ASI_ITLB_DATA_ACCESS + membar #Sync +2: + cmp %l0, (63 << 3) + blu,pt %xcc, 1b + add %l0, (1 << 3), %l0 + + nop; nop; nop + + clr %l0 /* TLB entry walker. */ +1: + /* Yes, the nops seem to be necessary for now, don't ask me why. -DaveM */ + ldxa [%l0] ASI_DTLB_TAG_READ, %g1 + nop + nop + nop + andn %g1, %l2, %g1 /* Get vaddr */ + cmp %g1, %g3 + blu,pn %xcc, 2f + cmp %g1, %g7 + bgeu,pn %xcc, 2f + nop + stxa %g0, [%l7] ASI_DMMU + stxa %g0, [%l0] ASI_DTLB_DATA_ACCESS + membar #Sync +2: + cmp %l0, (63 << 3) + blu,pt %xcc, 1b + add %l0, (1 << 3), %l0 + + nop; nop; nop + + + /* PROM never puts any TLB entries into the MMU with the lock bit + * set. So we gladly use tlb entry 63 for KERNBASE. And maybe 62 too. + */ + + sethi %hi(KERNBASE), %g3 + mov (63 << 3), %g7 + stxa %g3, [%l7] ASI_DMMU /* KERNBASE into TLB TAG */ + stxa %g5, [%g7] ASI_DTLB_DATA_ACCESS /* TTE into TLB DATA */ + membar #Sync + stxa %g3, [%l7] ASI_IMMU /* KERNBASE into TLB TAG */ + stxa %g5, [%g7] ASI_ITLB_DATA_ACCESS /* TTE into TLB DATA */ + membar #Sync + flush %g3 + membar #Sync + sethi %hi(_end), %g3 /* Check for bigkernel case */ + or %g3, %lo(_end), %g3 + srl %g3, 23, %g3 /* Check if _end > 8M */ + brz,pt %g3, 2f + sethi %hi(KERNBASE), %g3 /* Restore for fixup code below */ + sethi %hi(0x400000), %g3 + or %g3, %lo(0x400000), %g3 + add %g5, %g3, %g5 /* New tte data */ + andn %g5, (_PAGE_G), %g5 + sethi %hi(KERNBASE+0x400000), %g3 + or %g3, %lo(KERNBASE+0x400000), %g3 + mov (62 << 3), %g7 + stxa %g3, [%l7] ASI_DMMU + stxa %g5, [%g7] ASI_DTLB_DATA_ACCESS + membar #Sync + stxa %g3, [%l7] ASI_IMMU + stxa %g5, [%g7] ASI_ITLB_DATA_ACCESS + membar #Sync + flush %g3 + membar #Sync + sethi %hi(KERNBASE), %g3 /* Restore for fixup code below */ +2: ba,pt %xcc, 1f + nop +1: + set sun4u_init, %g2 + jmpl %g2 + %g0, %g0 + nop + +sun4u_init: + /* Set ctx 0 */ + mov PRIMARY_CONTEXT, %g7 + stxa %g0, [%g7] ASI_DMMU + membar #Sync + + mov SECONDARY_CONTEXT, %g7 + stxa %g0, [%g7] ASI_DMMU + membar #Sync + + /* We are now safely (we hope) in Nucleus context (0), rewrite + * the KERNBASE TTE's so they no longer have the global bit set. + * Don't forget to setup TAG_ACCESS first 8-) + */ + mov TLB_TAG_ACCESS, %g2 + stxa %g3, [%g2] ASI_IMMU + stxa %g3, [%g2] ASI_DMMU + membar #Sync + + BRANCH_IF_ANY_CHEETAH(g1,g7,cheetah_tlb_fixup) + + ba,pt %xcc, spitfire_tlb_fixup + nop + +cheetah_tlb_fixup: + set (0 << 16) | (15 << 3), %g7 + ldxa [%g7] ASI_ITLB_DATA_ACCESS, %g0 + ldxa [%g7] ASI_ITLB_DATA_ACCESS, %g1 + andn %g1, (_PAGE_G), %g1 + stxa %g1, [%g7] ASI_ITLB_DATA_ACCESS + membar #Sync + + ldxa [%g7] ASI_DTLB_DATA_ACCESS, %g0 + ldxa [%g7] ASI_DTLB_DATA_ACCESS, %g1 + andn %g1, (_PAGE_G), %g1 + stxa %g1, [%g7] ASI_DTLB_DATA_ACCESS + membar #Sync + + /* Kill instruction prefetch queues. */ + flush %g3 + membar #Sync + + mov 2, %g2 /* Set TLB type to cheetah+. */ + BRANCH_IF_CHEETAH_PLUS_OR_FOLLOWON(g1,g7,1f) + + mov 1, %g2 /* Set TLB type to cheetah. */ + +1: sethi %hi(tlb_type), %g1 + stw %g2, [%g1 + %lo(tlb_type)] + + BRANCH_IF_CHEETAH_PLUS_OR_FOLLOWON(g1,g7,1f) + ba,pt %xcc, 2f + nop + +1: /* Patch context register writes to support nucleus page + * size correctly. + */ + call cheetah_plus_patch_etrap + nop + call cheetah_plus_patch_rtrap + nop + call cheetah_plus_patch_fpdis + nop + call cheetah_plus_patch_winfixup + nop + + +2: /* Patch copy/page operations to cheetah optimized versions. */ + call cheetah_patch_copyops + nop + call cheetah_patch_cachetlbops + nop + + ba,pt %xcc, tlb_fixup_done + nop + +spitfire_tlb_fixup: + mov (63 << 3), %g7 + ldxa [%g7] ASI_ITLB_DATA_ACCESS, %g1 + andn %g1, (_PAGE_G), %g1 + stxa %g1, [%g7] ASI_ITLB_DATA_ACCESS + membar #Sync + + ldxa [%g7] ASI_DTLB_DATA_ACCESS, %g1 + andn %g1, (_PAGE_G), %g1 + stxa %g1, [%g7] ASI_DTLB_DATA_ACCESS + membar #Sync + + /* Kill instruction prefetch queues. */ + flush %g3 + membar #Sync + + /* Set TLB type to spitfire. */ + mov 0, %g2 + sethi %hi(tlb_type), %g1 + stw %g2, [%g1 + %lo(tlb_type)] + +tlb_fixup_done: + sethi %hi(init_thread_union), %g6 + or %g6, %lo(init_thread_union), %g6 + ldx [%g6 + TI_TASK], %g4 + mov %sp, %l6 + mov %o4, %l7 + +#if 0 /* We don't do it like this anymore, but for historical hack value + * I leave this snippet here to show how crazy we can be sometimes. 8-) + */ + + /* Setup "Linux Current Register", thanks Sun 8-) */ + wr %g0, 0x1, %pcr + + /* Blackbird errata workaround. See commentary in + * smp.c:smp_percpu_timer_interrupt() for more + * information. + */ + ba,pt %xcc, 99f + nop + .align 64 +99: wr %g6, %g0, %pic + rd %pic, %g0 +#endif + + wr %g0, ASI_P, %asi + mov 1, %g1 + sllx %g1, THREAD_SHIFT, %g1 + sub %g1, (STACKFRAME_SZ + STACK_BIAS), %g1 + add %g6, %g1, %sp + mov 0, %fp + + /* Set per-cpu pointer initially to zero, this makes + * the boot-cpu use the in-kernel-image per-cpu areas + * before setup_per_cpu_area() is invoked. + */ + clr %g5 + + wrpr %g0, 0, %wstate + wrpr %g0, 0x0, %tl + + /* Clear the bss */ + sethi %hi(__bss_start), %o0 + or %o0, %lo(__bss_start), %o0 + sethi %hi(_end), %o1 + or %o1, %lo(_end), %o1 + call __bzero + sub %o1, %o0, %o1 + + mov %l6, %o1 ! OpenPROM stack + call prom_init + mov %l7, %o0 ! OpenPROM cif handler + + /* Off we go.... */ + call start_kernel + nop + /* Not reached... */ + +/* IMPORTANT NOTE: Whenever making changes here, check + * trampoline.S as well. -jj */ + .globl setup_tba +setup_tba: /* i0 = is_starfire */ + save %sp, -160, %sp + + rdpr %tba, %g7 + sethi %hi(prom_tba), %o1 + or %o1, %lo(prom_tba), %o1 + stx %g7, [%o1] + + /* Setup "Linux" globals 8-) */ + rdpr %pstate, %o1 + mov %g6, %o2 + wrpr %o1, (PSTATE_AG|PSTATE_IE), %pstate + sethi %hi(sparc64_ttable_tl0), %g1 + wrpr %g1, %tba + mov %o2, %g6 + + /* Set up MMU globals */ + wrpr %o1, (PSTATE_MG|PSTATE_IE), %pstate + + /* Set fixed globals used by dTLB miss handler. */ +#define KERN_HIGHBITS ((_PAGE_VALID|_PAGE_SZ4MB)^0xfffff80000000000) +#define KERN_LOWBITS (_PAGE_CP | _PAGE_CV | _PAGE_P | _PAGE_W) + + mov TSB_REG, %g1 + stxa %g0, [%g1] ASI_DMMU + membar #Sync + stxa %g0, [%g1] ASI_IMMU + membar #Sync + mov TLB_SFSR, %g1 + sethi %uhi(KERN_HIGHBITS), %g2 + or %g2, %ulo(KERN_HIGHBITS), %g2 + sllx %g2, 32, %g2 + or %g2, KERN_LOWBITS, %g2 + + BRANCH_IF_ANY_CHEETAH(g3,g7,cheetah_vpte_base) + ba,pt %xcc, spitfire_vpte_base + nop + +cheetah_vpte_base: + sethi %uhi(VPTE_BASE_CHEETAH), %g3 + or %g3, %ulo(VPTE_BASE_CHEETAH), %g3 + ba,pt %xcc, 2f + sllx %g3, 32, %g3 + +spitfire_vpte_base: + sethi %uhi(VPTE_BASE_SPITFIRE), %g3 + or %g3, %ulo(VPTE_BASE_SPITFIRE), %g3 + sllx %g3, 32, %g3 + +2: + clr %g7 +#undef KERN_HIGHBITS +#undef KERN_LOWBITS + + /* Kill PROM timer */ + sethi %hi(0x80000000), %o2 + sllx %o2, 32, %o2 + wr %o2, 0, %tick_cmpr + + BRANCH_IF_ANY_CHEETAH(o2,o3,1f) + + ba,pt %xcc, 2f + nop + + /* Disable STICK_INT interrupts. */ +1: + sethi %hi(0x80000000), %o2 + sllx %o2, 32, %o2 + wr %o2, %asr25 + + /* Ok, we're done setting up all the state our trap mechanims needs, + * now get back into normal globals and let the PROM know what is up. + */ +2: + wrpr %g0, %g0, %wstate + wrpr %o1, PSTATE_IE, %pstate + + call init_irqwork_curcpu + nop + + call prom_set_trap_table + sethi %hi(sparc64_ttable_tl0), %o0 + + BRANCH_IF_CHEETAH_PLUS_OR_FOLLOWON(g2,g3,1f) + ba,pt %xcc, 2f + nop + +1: /* Start using proper page size encodings in ctx register. */ + sethi %uhi(CTX_CHEETAH_PLUS_NUC), %g3 + mov PRIMARY_CONTEXT, %g1 + sllx %g3, 32, %g3 + sethi %hi(CTX_CHEETAH_PLUS_CTX0), %g2 + or %g3, %g2, %g3 + stxa %g3, [%g1] ASI_DMMU + membar #Sync + +2: + rdpr %pstate, %o1 + or %o1, PSTATE_IE, %o1 + wrpr %o1, 0, %pstate + + ret + restore + +/* + * The following skips make 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 + +#ifdef CONFIG_SBUS +/* This is just a hack to fool make depend config.h discovering + strategy: As the .S files below need config.h, but + make depend does not find it for them, we include config.h + in head.S */ +#endif + +! 0x0000000000408000 + +#include "ttable.S" +#include "systbls.S" + + .align 1024 + .globl swapper_pg_dir +swapper_pg_dir: + .word 0 + +#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 + .globl prom_tba, tlb_type +prom_tba: .xword 0 +tlb_type: .word 0 /* Must NOT end up in BSS */ + .section ".fixup",#alloc,#execinstr + .globl __ret_efault +__ret_efault: + ret + restore %g0, -EFAULT, %o0 + |
