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-rw-r--r--arch/tile/kernel/head_32.S183
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diff --git a/arch/tile/kernel/head_32.S b/arch/tile/kernel/head_32.S
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-/*
- * Copyright 2010 Tilera Corporation. All Rights Reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation, version 2.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
- * NON INFRINGEMENT. See the GNU General Public License for
- * more details.
- *
- * TILE startup code.
- */
-
-#include <linux/linkage.h>
-#include <linux/init.h>
-#include <asm/page.h>
-#include <asm/pgtable.h>
-#include <asm/thread_info.h>
-#include <asm/processor.h>
-#include <asm/asm-offsets.h>
-#include <hv/hypervisor.h>
-#include <arch/chip.h>
-#include <arch/spr_def.h>
-
-/*
- * This module contains the entry code for kernel images. It performs the
- * minimal setup needed to call the generic C routines.
- */
-
- __HEAD
-ENTRY(_start)
- /* Notify the hypervisor of what version of the API we want */
- {
- movei r1, TILE_CHIP
- movei r2, TILE_CHIP_REV
- }
- {
- moveli r0, _HV_VERSION_OLD_HV_INIT
- jal _hv_init
- }
- /* Get a reasonable default ASID in r0 */
- {
- move r0, zero
- jal _hv_inquire_asid
- }
- /* Install the default page table */
- {
- moveli r6, lo16(swapper_pgprot - PAGE_OFFSET)
- move r4, r0 /* use starting ASID of range for this page table */
- }
- {
- moveli r0, lo16(swapper_pg_dir - PAGE_OFFSET)
- auli r6, r6, ha16(swapper_pgprot - PAGE_OFFSET)
- }
- {
- lw r2, r6
- addi r6, r6, 4
- }
- {
- lw r3, r6
- auli r0, r0, ha16(swapper_pg_dir - PAGE_OFFSET)
- }
- {
- finv r6
- move r1, zero /* high 32 bits of CPA is zero */
- }
- {
- moveli lr, lo16(1f)
- moveli r5, CTX_PAGE_FLAG
- }
- {
- auli lr, lr, ha16(1f)
- j _hv_install_context
- }
-1:
-
- /* Get our processor number and save it away in SAVE_K_0. */
- jal _hv_inquire_topology
- mulll_uu r4, r1, r2 /* r1 == y, r2 == width */
- add r4, r4, r0 /* r0 == x, so r4 == cpu == y*width + x */
-
-#ifdef CONFIG_SMP
- /*
- * Load up our per-cpu offset. When the first (master) tile
- * boots, this value is still zero, so we will load boot_pc
- * with start_kernel, and boot_sp at the top of init_stack.
- * The master tile initializes the per-cpu offset array, so that
- * when subsequent (secondary) tiles boot, they will instead load
- * from their per-cpu versions of boot_sp and boot_pc.
- */
- moveli r5, lo16(__per_cpu_offset)
- auli r5, r5, ha16(__per_cpu_offset)
- s2a r5, r4, r5
- lw r5, r5
- bnz r5, 1f
-
- /*
- * Save the width and height to the smp_topology variable
- * for later use.
- */
- moveli r0, lo16(smp_topology + HV_TOPOLOGY_WIDTH_OFFSET)
- auli r0, r0, ha16(smp_topology + HV_TOPOLOGY_WIDTH_OFFSET)
- {
- sw r0, r2
- addi r0, r0, (HV_TOPOLOGY_HEIGHT_OFFSET - HV_TOPOLOGY_WIDTH_OFFSET)
- }
- sw r0, r3
-1:
-#else
- move r5, zero
-#endif
-
- /* Load and go with the correct pc and sp. */
- {
- addli r1, r5, lo16(boot_sp)
- addli r0, r5, lo16(boot_pc)
- }
- {
- auli r1, r1, ha16(boot_sp)
- auli r0, r0, ha16(boot_pc)
- }
- lw r0, r0
- lw sp, r1
- or r4, sp, r4
- mtspr SPR_SYSTEM_SAVE_K_0, r4 /* save ksp0 + cpu */
- {
- move lr, zero /* stop backtraces in the called function */
- jr r0
- }
- ENDPROC(_start)
-
-__PAGE_ALIGNED_BSS
- .align PAGE_SIZE
-ENTRY(empty_zero_page)
- .fill PAGE_SIZE,1,0
- END(empty_zero_page)
-
- .macro PTE va, cpa, bits1, no_org=0
- .ifeq \no_org
- .org swapper_pg_dir + PGD_INDEX(\va) * HV_PTE_SIZE
- .endif
- .word HV_PTE_PAGE | HV_PTE_DIRTY | HV_PTE_PRESENT | HV_PTE_ACCESSED | \
- (HV_PTE_MODE_CACHE_NO_L3 << HV_PTE_INDEX_MODE)
- .word (\bits1) | (HV_CPA_TO_PTFN(\cpa) << (HV_PTE_INDEX_PTFN - 32))
- .endm
-
-__PAGE_ALIGNED_DATA
- .align PAGE_SIZE
-ENTRY(swapper_pg_dir)
- /*
- * All data pages from PAGE_OFFSET to MEM_USER_INTRPT are mapped as
- * VA = PA + PAGE_OFFSET. We remap things with more precise access
- * permissions and more respect for size of RAM later.
- */
- .set addr, 0
- .rept (MEM_USER_INTRPT - PAGE_OFFSET) >> PGDIR_SHIFT
- PTE addr + PAGE_OFFSET, addr, (1 << (HV_PTE_INDEX_READABLE - 32)) | \
- (1 << (HV_PTE_INDEX_WRITABLE - 32))
- .set addr, addr + PGDIR_SIZE
- .endr
-
- /* The true text VAs are mapped as VA = PA + MEM_SV_START */
- PTE MEM_SV_START, 0, (1 << (HV_PTE_INDEX_READABLE - 32)) | \
- (1 << (HV_PTE_INDEX_EXECUTABLE - 32))
- .org swapper_pg_dir + PGDIR_SIZE
- END(swapper_pg_dir)
-
- /*
- * Isolate swapper_pgprot to its own cache line, since each cpu
- * starting up will read it using VA-is-PA and local homing.
- * This would otherwise likely conflict with other data on the cache
- * line, once we have set its permanent home in the page tables.
- */
- __INITDATA
- .align CHIP_L2_LINE_SIZE()
-ENTRY(swapper_pgprot)
- PTE 0, 0, (1 << (HV_PTE_INDEX_READABLE - 32)) | \
- (1 << (HV_PTE_INDEX_WRITABLE - 32)), 1
- .align CHIP_L2_LINE_SIZE()
- END(swapper_pgprot)
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