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279 lines
7.3 KiB
279 lines
7.3 KiB
/*
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* Copyright 2011 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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/* Extract two 32-bit bit values that were read into one register. */
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#ifdef __BIG_ENDIAN__
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#define GET_FIRST_INT(rd, rs) shrsi rd, rs, 32
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#define GET_SECOND_INT(rd, rs) addxi rd, rs, 0
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#else
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#define GET_FIRST_INT(rd, rs) addxi rd, rs, 0
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#define GET_SECOND_INT(rd, rs) shrsi rd, rs, 32
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#endif
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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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#if KERNEL_PL == 1 && _HV_VERSION == 13
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/* Support older hypervisors by asking for API version 12. */
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movei r0, _HV_VERSION_OLD_HV_INIT
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#else
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movei r0, _HV_VERSION
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#endif
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movei r1, TILE_CHIP
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}
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{
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movei r2, TILE_CHIP_REV
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movei r3, KERNEL_PL
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}
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jal _hv_init
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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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/*
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* Install the default page table. The relocation required to
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* statically define the table is a bit too complex, so we have
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* to plug in the pointer from the L0 to the L1 table by hand.
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* We only do this on the first cpu to boot, though, since the
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* other CPUs should see a properly-constructed page table.
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*/
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{
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GET_FIRST_INT(r2, r0) /* ASID for hv_install_context */
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moveli r4, hw1_last(swapper_pgprot - PAGE_OFFSET)
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}
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{
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shl16insli r4, r4, hw0(swapper_pgprot - PAGE_OFFSET)
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}
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{
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ld r1, r4 /* access_pte for hv_install_context */
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}
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{
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moveli r0, hw1_last(.Lsv_data_pmd - PAGE_OFFSET)
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moveli r6, hw1_last(temp_data_pmd - PAGE_OFFSET)
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}
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{
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/* After initializing swapper_pgprot, HV_PTE_GLOBAL is set. */
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bfextu r7, r1, HV_PTE_INDEX_GLOBAL, HV_PTE_INDEX_GLOBAL
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finv r4
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}
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bnez r7, .Lno_write
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{
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shl16insli r0, r0, hw0(.Lsv_data_pmd - PAGE_OFFSET)
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shl16insli r6, r6, hw0(temp_data_pmd - PAGE_OFFSET)
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}
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{
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/* Cut off the low bits of the PT address. */
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shrui r6, r6, HV_LOG2_PAGE_TABLE_ALIGN
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/* Start with our access pte. */
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move r5, r1
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}
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{
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/* Stuff the address into the page table pointer slot of the PTE. */
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bfins r5, r6, HV_PTE_INDEX_PTFN, \
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HV_PTE_INDEX_PTFN + HV_PTE_PTFN_BITS - 1
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}
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{
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/* Store the L0 data PTE. */
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st r0, r5
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addli r6, r6, (temp_code_pmd - temp_data_pmd) >> \
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HV_LOG2_PAGE_TABLE_ALIGN
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}
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{
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addli r0, r0, .Lsv_code_pmd - .Lsv_data_pmd
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bfins r5, r6, HV_PTE_INDEX_PTFN, \
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HV_PTE_INDEX_PTFN + HV_PTE_PTFN_BITS - 1
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}
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/* Store the L0 code PTE. */
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st r0, r5
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.Lno_write:
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moveli lr, hw2_last(1f)
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{
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shl16insli lr, lr, hw1(1f)
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moveli r0, hw1_last(swapper_pg_dir - PAGE_OFFSET)
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}
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{
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shl16insli lr, lr, hw0(1f)
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shl16insli r0, r0, hw0(swapper_pg_dir - PAGE_OFFSET)
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}
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{
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moveli r3, CTX_PAGE_FLAG
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j _hv_install_context
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}
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1:
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/* Install the interrupt base. */
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moveli r0, hw2_last(intrpt_start)
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shl16insli r0, r0, hw1(intrpt_start)
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shl16insli r0, r0, hw0(intrpt_start)
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mtspr SPR_INTERRUPT_VECTOR_BASE_K, r0
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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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{
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GET_FIRST_INT(r5, r1) /* r5 = width */
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GET_SECOND_INT(r4, r0) /* r4 = y */
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}
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{
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GET_FIRST_INT(r6, r0) /* r6 = x */
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mul_lu_lu r4, r4, r5
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}
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{
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add r4, r4, r6 /* r4 == cpu == y*width + x */
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}
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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 with 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, hw2_last(__per_cpu_offset)
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shl16insli r5, r5, hw1(__per_cpu_offset)
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shl16insli r5, r5, hw0(__per_cpu_offset)
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shl3add r5, r4, r5
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ld r5, r5
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bnez 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, hw2_last(smp_topology + HV_TOPOLOGY_WIDTH_OFFSET)
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shl16insli r0, r0, hw1(smp_topology + HV_TOPOLOGY_WIDTH_OFFSET)
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shl16insli r0, r0, hw0(smp_topology + HV_TOPOLOGY_WIDTH_OFFSET)
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st r0, r1
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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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moveli r1, hw2_last(boot_sp)
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moveli r0, hw2_last(boot_pc)
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}
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{
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shl16insli r1, r1, hw1(boot_sp)
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shl16insli r0, r0, hw1(boot_pc)
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}
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{
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shl16insli r1, r1, hw0(boot_sp)
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shl16insli r0, r0, hw0(boot_pc)
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}
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{
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add r1, r1, r5
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add r0, r0, r5
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}
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ld r0, r0
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ld sp, r1
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shli r4, r4, CPU_SHIFT
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bfins r4, sp, 0, CPU_SHIFT-1
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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 cpa, bits1
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.quad HV_PTE_PAGE | HV_PTE_DIRTY | HV_PTE_PRESENT | HV_PTE_ACCESSED |\
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HV_PTE_GLOBAL | (HV_PTE_MODE_CACHE_NO_L3 << HV_PTE_INDEX_MODE) |\
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(\bits1) | (HV_CPA_TO_PTFN(\cpa) << HV_PTE_INDEX_PTFN)
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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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.org swapper_pg_dir + PGD_INDEX(PAGE_OFFSET) * HV_PTE_SIZE
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.Lsv_data_pmd:
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.quad 0 /* PTE temp_data_pmd - PAGE_OFFSET, 0 */
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.org swapper_pg_dir + PGD_INDEX(MEM_SV_START) * HV_PTE_SIZE
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.Lsv_code_pmd:
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.quad 0 /* PTE temp_code_pmd - PAGE_OFFSET, 0 */
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.org swapper_pg_dir + SIZEOF_PGD
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END(swapper_pg_dir)
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.align HV_PAGE_TABLE_ALIGN
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ENTRY(temp_data_pmd)
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/*
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* We fill the PAGE_OFFSET pmd with huge pages with
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* VA = PA + PAGE_OFFSET. We remap things with more precise access
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* permissions later.
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*/
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.set addr, 0
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.rept PTRS_PER_PMD
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PTE addr, HV_PTE_READABLE | HV_PTE_WRITABLE
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.set addr, addr + HPAGE_SIZE
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.endr
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.org temp_data_pmd + SIZEOF_PMD
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END(temp_data_pmd)
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.align HV_PAGE_TABLE_ALIGN
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ENTRY(temp_code_pmd)
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/*
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* We fill the MEM_SV_START pmd with huge pages with
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* VA = PA + PAGE_OFFSET. We remap things with more precise access
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* permissions later.
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*/
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.set addr, 0
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.rept PTRS_PER_PMD
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PTE addr, HV_PTE_READABLE | HV_PTE_EXECUTABLE
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.set addr, addr + HPAGE_SIZE
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.endr
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.org temp_code_pmd + SIZEOF_PMD
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END(temp_code_pmd)
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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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.quad HV_PTE_PRESENT | (HV_PTE_MODE_CACHE_NO_L3 << HV_PTE_INDEX_MODE)
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.align CHIP_L2_LINE_SIZE()
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END(swapper_pgprot)
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