head.S
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- /* $Id: head.S,v 1.86 2001/12/05 01:02:16 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/asm_offsets.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>
-
- /* 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
- .globl silo_args
- .ascii "HdrS"
- .word LINUX_VERSION_CODE
- .half 0x0203 /* 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_len
- .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,g5,cheetah_boot)
- BRANCH_IF_CHEETAH_PLUS_OR_FOLLOWON(g1,g5,cheetah_plus_boot)
- ba,pt %xcc, spitfire_boot
- nop
- cheetah_plus_boot:
- /* Preserve OBP choosen 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), %g5
- or %g5, %ulo(DCU_ME|DCU_RE|DCU_HPE|DCU_SPE|DCU_SL|DCU_WE), %g5
- sllx %g5, 32, %g5
- or %g5, DCU_DM | DCU_IM | DCU_DC | DCU_IC, %g5
- stxa %g5, [%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
- cheetah_got_tlbentry:
- ldxa [%l0] ASI_ITLB_DATA_ACCESS, %g0
- ldxa [%l0] ASI_ITLB_DATA_ACCESS, %g1
- membar #Sync
- and %g1, %g3, %g1
- sub %g1, %g2, %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
- 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. */
- sub %g1, %g2, %g1 /* Get rid of %pc offset to get base. */
- /* 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
- sethi %uhi(PAGE_OFFSET), %g4
- sllx %g4, 32, %g4
- /* 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,g5,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(g5,g7,1f)
- mov 1, %g2 /* Set TLB type to cheetah. */
- 1: sethi %hi(tlb_type), %g5
- stw %g2, [%g5 + %lo(tlb_type)]
- /* Patch copy/page operations to cheetah optimized versions. */
- call cheetah_patch_copyops
- nop
- call cheetah_patch_pgcopyops
- 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), %g5
- stw %g2, [%g5 + %lo(tlb_type)]
- tlb_fixup_done:
- sethi %hi(init_task_union), %g6
- or %g6, %lo(init_task_union), %g6
- 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, %g5
- sllx %g5, THREAD_SHIFT, %g5
- sub %g5, (REGWIN_SZ + STACK_BIAS), %g5
- add %g6, %g5, %sp
- mov 0, %fp
- 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), %g5
- wrpr %g5, %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
- 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
- /* Setup Interrupt globals */
- wrpr %o1, (PSTATE_IG|PSTATE_IE), %pstate
- #ifndef CONFIG_SMP
- sethi %hi(__up_workvec), %g5
- or %g5, %lo(__up_workvec), %g6
- #else
- /* By definition of where we are, this is boot_cpu. */
- brz,pt %i0, not_starfire
- sethi %hi(0x1fff4000), %g1
- or %g1, %lo(0x1fff4000), %g1
- sllx %g1, 12, %g1
- or %g1, 0xd0, %g1
- lduwa [%g1] ASI_PHYS_BYPASS_EC_E, %g1
- b,pt %xcc, set_worklist
- nop
- not_starfire:
- BRANCH_IF_ANY_CHEETAH(g1,g5,is_cheetah)
- ba,pt %xcc, not_cheetah
- nop
- is_cheetah:
- ldxa [%g0] ASI_SAFARI_CONFIG, %g1
- srlx %g1, 17, %g1
- ba,pt %xcc, set_worklist
- and %g1, 0x3ff, %g1 ! 10bit Safari Agent ID
- not_cheetah:
- ldxa [%g0] ASI_UPA_CONFIG, %g1
- srlx %g1, 17, %g1
- and %g1, 0x1f, %g1
- /* In theory this is: &(cpu_data[boot_cpu_id].irq_worklists[0]) */
- set_worklist:
- sethi %hi(cpu_data), %g5
- or %g5, %lo(cpu_data), %g5
- sllx %g1, 7, %g1
- add %g5, %g1, %g5
- add %g5, 64, %g6
- #endif
- /* Kill PROM timer */
- wr %g0, 0, %tick_cmpr
- BRANCH_IF_ANY_CHEETAH(g1,g5,1f)
- ba,pt %xcc, 2f
- nop
- /* Disable STICK_INT interrupts. */
- 1:
- sethi %hi(0x80000000), %g1
- sllx %g1, 32, %g1
- wr %g1, %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
- sethi %hi(sparc64_ttable_tl0), %g5
- call prom_set_trap_table
- mov %g5, %o0
- 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
- prom_tba: .xword 0
- .section ".fixup",#alloc,#execinstr
- .globl __ret_efault
- __ret_efault:
- ret
- restore %g0, -EFAULT, %o0