| /* $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 |
| * 0x0000000000404000 to 0x0000000000408000. |
| */ |
| .text |
| .globl start, _start, stext, _stext |
| _start: |
| start: |
| _stext: |
| stext: |
| ! 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 |
| |
| /* PROM cif handler code address is in %o4. */ |
| sparc64_boot: |
| 1: rd %pc, %g7 |
| set 1b, %g1 |
| cmp %g1, %g7 |
| be,pn %xcc, sparc64_boot_after_remap |
| mov %o4, %l7 |
| |
| /* We need to remap the kernel. Use position independant |
| * code to remap us to KERNBASE. |
| * |
| * SILO can invoke us with 32-bit address masking enabled, |
| * so make sure that's clear. |
| */ |
| rdpr %pstate, %g1 |
| andn %g1, PSTATE_AM, %g1 |
| 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_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 |
| prom_finddev_name: |
| .asciz "finddevice" |
| prom_chosen_path: |
| .asciz "/chosen" |
| prom_getprop_name: |
| .asciz "getprop" |
| prom_mmu_name: |
| .asciz "mmu" |
| prom_callmethod_name: |
| .asciz "call-method" |
| prom_translate_name: |
| .asciz "translate" |
| prom_map_name: |
| .asciz "map" |
| prom_unmap_name: |
| .asciz "unmap" |
| .align 4 |
| prom_mmu_ihandle_cache: |
| .word 0 |
| prom_boot_mapped_pc: |
| .word 0 |
| prom_boot_mapping_mode: |
| .word 0 |
| .align 8 |
| prom_boot_mapping_phys_high: |
| .xword 0 |
| prom_boot_mapping_phys_low: |
| .xword 0 |
| 1: |
| rd %pc, %l0 |
| mov (1b - prom_finddev_name), %l1 |
| mov (1b - prom_chosen_path), %l2 |
| mov (1b - prom_boot_mapped_pc), %l3 |
| sub %l0, %l1, %l1 |
| sub %l0, %l2, %l2 |
| sub %l0, %l3, %l3 |
| stw %l0, [%l3] |
| sub %sp, (192 + 128), %sp |
| |
| /* chosen_node = prom_finddevice("/chosen") */ |
| stx %l1, [%sp + 2047 + 128 + 0x00] ! service, "finddevice" |
| 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, "/chosen" |
| stx %g0, [%sp + 2047 + 128 + 0x20] ! ret1 |
| call %l7 |
| add %sp, (2047 + 128), %o0 ! argument array |
| |
| ldx [%sp + 2047 + 128 + 0x20], %l4 ! chosen device node |
| |
| mov (1b - prom_getprop_name), %l1 |
| mov (1b - prom_mmu_name), %l2 |
| mov (1b - prom_mmu_ihandle_cache), %l5 |
| sub %l0, %l1, %l1 |
| sub %l0, %l2, %l2 |
| sub %l0, %l5, %l5 |
| |
| /* prom_mmu_ihandle_cache = prom_getint(chosen_node, "mmu") */ |
| 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, chosen_node |
| stx %l2, [%sp + 2047 + 128 + 0x20] ! arg2, "mmu" |
| stx %l5, [%sp + 2047 + 128 + 0x28] ! arg3, &prom_mmu_ihandle_cache |
| mov 4, %l3 |
| stx %l3, [%sp + 2047 + 128 + 0x30] ! arg4, sizeof(arg3) |
| stx %g0, [%sp + 2047 + 128 + 0x38] ! ret1 |
| call %l7 |
| add %sp, (2047 + 128), %o0 ! argument array |
| |
| mov (1b - prom_callmethod_name), %l1 |
| mov (1b - prom_translate_name), %l2 |
| sub %l0, %l1, %l1 |
| sub %l0, %l2, %l2 |
| lduw [%l5], %l5 ! prom_mmu_ihandle_cache |
| |
| stx %l1, [%sp + 2047 + 128 + 0x00] ! service, "call-method" |
| mov 3, %l3 |
| stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 3 |
| mov 5, %l3 |
| stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 5 |
| stx %l2, [%sp + 2047 + 128 + 0x18] ! arg1: "translate" |
| stx %l5, [%sp + 2047 + 128 + 0x20] ! arg2: prom_mmu_ihandle_cache |
| /* PAGE align */ |
| srlx %l0, 13, %l3 |
| sllx %l3, 13, %l3 |
| stx %l3, [%sp + 2047 + 128 + 0x28] ! arg3: vaddr, our PC |
| stx %g0, [%sp + 2047 + 128 + 0x30] ! res1 |
| stx %g0, [%sp + 2047 + 128 + 0x38] ! res2 |
| stx %g0, [%sp + 2047 + 128 + 0x40] ! res3 |
| stx %g0, [%sp + 2047 + 128 + 0x48] ! res4 |
| stx %g0, [%sp + 2047 + 128 + 0x50] ! res5 |
| call %l7 |
| add %sp, (2047 + 128), %o0 ! argument array |
| |
| ldx [%sp + 2047 + 128 + 0x40], %l1 ! translation mode |
| mov (1b - prom_boot_mapping_mode), %l4 |
| sub %l0, %l4, %l4 |
| stw %l1, [%l4] |
| mov (1b - prom_boot_mapping_phys_high), %l4 |
| sub %l0, %l4, %l4 |
| ldx [%sp + 2047 + 128 + 0x48], %l2 ! physaddr high |
| stx %l2, [%l4 + 0x0] |
| ldx [%sp + 2047 + 128 + 0x50], %l3 ! physaddr low |
| /* 4MB align */ |
| srlx %l3, 22, %l3 |
| sllx %l3, 22, %l3 |
| stx %l3, [%l4 + 0x8] |
| |
| /* Leave service as-is, "call-method" */ |
| mov 7, %l3 |
| stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 7 |
| mov 1, %l3 |
| stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 1 |
| mov (1b - prom_map_name), %l3 |
| sub %l0, %l3, %l3 |
| stx %l3, [%sp + 2047 + 128 + 0x18] ! arg1: "map" |
| /* Leave arg2 as-is, prom_mmu_ihandle_cache */ |
| mov -1, %l3 |
| stx %l3, [%sp + 2047 + 128 + 0x28] ! arg3: mode (-1 default) |
| sethi %hi(8 * 1024 * 1024), %l3 |
| stx %l3, [%sp + 2047 + 128 + 0x30] ! arg4: size (8MB) |
| sethi %hi(KERNBASE), %l3 |
| stx %l3, [%sp + 2047 + 128 + 0x38] ! arg5: vaddr (KERNBASE) |
| stx %g0, [%sp + 2047 + 128 + 0x40] ! arg6: empty |
| mov (1b - prom_boot_mapping_phys_low), %l3 |
| sub %l0, %l3, %l3 |
| ldx [%l3], %l3 |
| stx %l3, [%sp + 2047 + 128 + 0x48] ! arg7: phys addr |
| call %l7 |
| add %sp, (2047 + 128), %o0 ! argument array |
| |
| add %sp, (192 + 128), %sp |
| |
| sparc64_boot_after_remap: |
| 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 |
| |
| ba,a,pt %xcc, jump_to_sun4u_init |
| |
| 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 |
| |
| jump_to_sun4u_init: |
| /* |
| * 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 |
| |
| 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 |
| |
| BRANCH_IF_ANY_CHEETAH(g1,g7,cheetah_tlb_fixup) |
| |
| ba,pt %xcc, spitfire_tlb_fixup |
| nop |
| |
| cheetah_tlb_fixup: |
| 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)] |
| |
| /* Patch copy/page operations to cheetah optimized versions. */ |
| call cheetah_patch_copyops |
| nop |
| call cheetah_patch_copy_page |
| nop |
| call cheetah_patch_cachetlbops |
| nop |
| |
| ba,pt %xcc, tlb_fixup_done |
| nop |
| |
| spitfire_tlb_fixup: |
| /* 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 |
| |
| 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... */ |
| |
| /* This is meant to allow the sharing of this code between |
| * boot processor invocation (via setup_tba() below) and |
| * secondary processor startup (via trampoline.S). The |
| * 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. */ |
| rdpr %pstate, %o1 |
| andn %o1, PSTATE_IE, %o1 |
| wrpr %o1, 0x0, %pstate |
| wrpr %g0, 15, %pil |
| |
| /* Make the firmware call to jump over to the Linux trap table. */ |
| call prom_set_trap_table |
| sethi %hi(sparc64_ttable_tl0), %o0 |
| |
| /* Start using proper page size encodings in ctx register. */ |
| sethi %hi(sparc64_kern_pri_context), %g3 |
| ldx [%g3 + %lo(sparc64_kern_pri_context)], %g2 |
| mov PRIMARY_CONTEXT, %g1 |
| stxa %g2, [%g1] ASI_DMMU |
| membar #Sync |
| |
| /* The Linux trap handlers expect various trap global registers |
| * to be setup with some fixed values. So here we set these |
| * up very carefully. These globals are: |
| * |
| * Alternate Globals (PSTATE_AG): |
| * |
| * %g6 --> current_thread_info() |
| * |
| * MMU Globals (PSTATE_MG): |
| * |
| * %g1 --> TLB_SFSR |
| * %g2 --> ((_PAGE_VALID | _PAGE_SZ4MB | |
| * _PAGE_CP | _PAGE_CV | _PAGE_P | _PAGE_W) |
| * ^ 0xfffff80000000000) |
| * (this %g2 value is used for computing the PAGE_OFFSET kernel |
| * TLB entries quickly, the virtual address of the fault XOR'd |
| * with this %g2 value is the PTE to load into the TLB) |
| * %g3 --> VPTE_BASE_CHEETAH or VPTE_BASE_SPITFIRE |
| * |
| * Interrupt Globals (PSTATE_IG, setup by init_irqwork_curcpu()): |
| * |
| * %g6 --> __irq_work[smp_processor_id()] |
| */ |
| |
| rdpr %pstate, %o1 |
| mov %g6, %o2 |
| wrpr %o1, PSTATE_AG, %pstate |
| mov %o2, %g6 |
| |
| #define KERN_HIGHBITS ((_PAGE_VALID|_PAGE_SZ4MB)^0xfffff80000000000) |
| #define KERN_LOWBITS (_PAGE_CP | _PAGE_CV | _PAGE_P | _PAGE_W) |
| wrpr %o1, PSTATE_MG, %pstate |
| 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,g7,8f) |
| ba,pt %xcc, 9f |
| nop |
| |
| 8: |
| sethi %uhi(VPTE_BASE_CHEETAH), %g3 |
| or %g3, %ulo(VPTE_BASE_CHEETAH), %g3 |
| ba,pt %xcc, 2f |
| sllx %g3, 32, %g3 |
| |
| 9: |
| 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 |
| |
| 2: |
| wrpr %g0, %g0, %wstate |
| wrpr %o1, 0x0, %pstate |
| |
| call init_irqwork_curcpu |
| nop |
| |
| /* Now we can turn interrupts back on. */ |
| rdpr %pstate, %o1 |
| or %o1, PSTATE_IE, %o1 |
| wrpr %o1, 0, %pstate |
| wrpr %g0, 0x0, %pil |
| |
| ret |
| restore |
| |
| .globl setup_tba |
| setup_tba: /* i0 = is_starfire */ |
| save %sp, -192, %sp |
| |
| /* The boot processor is the only cpu which invokes this |
| * routine, the other cpus set things up via trampoline.S. |
| * So save the OBP trap table address here. |
| */ |
| rdpr %tba, %g7 |
| sethi %hi(prom_tba), %o1 |
| or %o1, %lo(prom_tba), %o1 |
| stx %g7, [%o1] |
| |
| call setup_trap_table |
| nop |
| |
| 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 skip makes sure the trap table in ttable.S is aligned |
| * on a 32K boundary as required by the v9 specs for TBA register. |
| */ |
| 1: |
| .skip 0x4000 + _start - 1b |
| |
| #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" |
| |
| .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, __retl_efault |
| __ret_efault: |
| ret |
| restore %g0, -EFAULT, %o0 |
| __retl_efault: |
| retl |
| mov -EFAULT, %o0 |
