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183 lines
4.8 KiB
183 lines
4.8 KiB
/*
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* Copyright 2010 Tilera Corporation. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for
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* more details.
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*
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* TILE startup code.
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*/
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#include <linux/linkage.h>
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#include <linux/init.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <asm/thread_info.h>
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#include <asm/processor.h>
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#include <asm/asm-offsets.h>
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#include <hv/hypervisor.h>
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#include <arch/chip.h>
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#include <arch/spr_def.h>
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/*
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* This module contains the entry code for kernel images. It performs the
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* minimal setup needed to call the generic C routines.
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*/
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__HEAD
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ENTRY(_start)
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/* Notify the hypervisor of what version of the API we want */
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{
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movei r1, TILE_CHIP
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movei r2, TILE_CHIP_REV
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}
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{
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moveli r0, _HV_VERSION_OLD_HV_INIT
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jal _hv_init
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}
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/* Get a reasonable default ASID in r0 */
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{
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move r0, zero
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jal _hv_inquire_asid
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}
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/* Install the default page table */
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{
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moveli r6, lo16(swapper_pgprot - PAGE_OFFSET)
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move r4, r0 /* use starting ASID of range for this page table */
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}
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{
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moveli r0, lo16(swapper_pg_dir - PAGE_OFFSET)
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auli r6, r6, ha16(swapper_pgprot - PAGE_OFFSET)
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}
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{
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lw r2, r6
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addi r6, r6, 4
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}
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{
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lw r3, r6
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auli r0, r0, ha16(swapper_pg_dir - PAGE_OFFSET)
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}
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{
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finv r6
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move r1, zero /* high 32 bits of CPA is zero */
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}
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{
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moveli lr, lo16(1f)
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moveli r5, CTX_PAGE_FLAG
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}
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{
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auli lr, lr, ha16(1f)
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j _hv_install_context
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}
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1:
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/* Get our processor number and save it away in SAVE_K_0. */
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jal _hv_inquire_topology
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mulll_uu r4, r1, r2 /* r1 == y, r2 == width */
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add r4, r4, r0 /* r0 == x, so r4 == cpu == y*width + x */
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#ifdef CONFIG_SMP
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/*
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* Load up our per-cpu offset. When the first (master) tile
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* boots, this value is still zero, so we will load boot_pc
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* with start_kernel, and boot_sp at the top of init_stack.
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* The master tile initializes the per-cpu offset array, so that
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* when subsequent (secondary) tiles boot, they will instead load
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* from their per-cpu versions of boot_sp and boot_pc.
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*/
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moveli r5, lo16(__per_cpu_offset)
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auli r5, r5, ha16(__per_cpu_offset)
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s2a r5, r4, r5
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lw r5, r5
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bnz r5, 1f
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/*
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* Save the width and height to the smp_topology variable
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* for later use.
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*/
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moveli r0, lo16(smp_topology + HV_TOPOLOGY_WIDTH_OFFSET)
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auli r0, r0, ha16(smp_topology + HV_TOPOLOGY_WIDTH_OFFSET)
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{
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sw r0, r2
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addi r0, r0, (HV_TOPOLOGY_HEIGHT_OFFSET - HV_TOPOLOGY_WIDTH_OFFSET)
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}
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sw r0, r3
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1:
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#else
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move r5, zero
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#endif
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/* Load and go with the correct pc and sp. */
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{
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addli r1, r5, lo16(boot_sp)
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addli r0, r5, lo16(boot_pc)
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}
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{
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auli r1, r1, ha16(boot_sp)
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auli r0, r0, ha16(boot_pc)
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}
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lw r0, r0
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lw sp, r1
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or r4, sp, r4
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mtspr SPR_SYSTEM_SAVE_K_0, r4 /* save ksp0 + cpu */
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{
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move lr, zero /* stop backtraces in the called function */
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jr r0
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}
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ENDPROC(_start)
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__PAGE_ALIGNED_BSS
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.align PAGE_SIZE
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ENTRY(empty_zero_page)
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.fill PAGE_SIZE,1,0
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END(empty_zero_page)
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.macro PTE va, cpa, bits1, no_org=0
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.ifeq \no_org
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.org swapper_pg_dir + PGD_INDEX(\va) * HV_PTE_SIZE
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.endif
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.word HV_PTE_PAGE | HV_PTE_DIRTY | HV_PTE_PRESENT | HV_PTE_ACCESSED | \
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(HV_PTE_MODE_CACHE_NO_L3 << HV_PTE_INDEX_MODE)
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.word (\bits1) | (HV_CPA_TO_PTFN(\cpa) << (HV_PTE_INDEX_PTFN - 32))
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.endm
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__PAGE_ALIGNED_DATA
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.align PAGE_SIZE
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ENTRY(swapper_pg_dir)
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/*
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* All data pages from PAGE_OFFSET to MEM_USER_INTRPT are mapped as
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* VA = PA + PAGE_OFFSET. We remap things with more precise access
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* permissions and more respect for size of RAM later.
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*/
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.set addr, 0
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.rept (MEM_USER_INTRPT - PAGE_OFFSET) >> PGDIR_SHIFT
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PTE addr + PAGE_OFFSET, addr, (1 << (HV_PTE_INDEX_READABLE - 32)) | \
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(1 << (HV_PTE_INDEX_WRITABLE - 32))
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.set addr, addr + PGDIR_SIZE
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.endr
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/* The true text VAs are mapped as VA = PA + MEM_SV_START */
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PTE MEM_SV_START, 0, (1 << (HV_PTE_INDEX_READABLE - 32)) | \
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(1 << (HV_PTE_INDEX_EXECUTABLE - 32))
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.org swapper_pg_dir + PGDIR_SIZE
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END(swapper_pg_dir)
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/*
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* Isolate swapper_pgprot to its own cache line, since each cpu
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* starting up will read it using VA-is-PA and local homing.
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* This would otherwise likely conflict with other data on the cache
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* line, once we have set its permanent home in the page tables.
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*/
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__INITDATA
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.align CHIP_L2_LINE_SIZE()
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ENTRY(swapper_pgprot)
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PTE 0, 0, (1 << (HV_PTE_INDEX_READABLE - 32)) | \
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(1 << (HV_PTE_INDEX_WRITABLE - 32)), 1
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.align CHIP_L2_LINE_SIZE()
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END(swapper_pgprot)
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