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08dbd0f8ef
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 and only version 2 as published by the free software foundation 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 see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 51 franklin street fifth floor boston ma 02110 1301 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 94 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190529141334.043630402@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
223 lines
5.4 KiB
ArmAsm
223 lines
5.4 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Early kernel startup code for Hexagon
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*
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* Copyright (c) 2010-2013, The Linux Foundation. All rights reserved.
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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/asm-offsets.h>
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#include <asm/mem-layout.h>
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#include <asm/vm_mmu.h>
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#include <asm/page.h>
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#include <asm/hexagon_vm.h>
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#define SEGTABLE_ENTRIES #0x0e0
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__INIT
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ENTRY(stext)
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/*
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* VMM will already have set up true vector page, MMU, etc.
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* To set up initial kernel identity map, we have to pass
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* the VMM a pointer to some canonical page tables. In
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* this implementation, we're assuming that we've got
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* them precompiled. Generate value in R24, as we'll need
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* it again shortly.
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*/
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r24.L = #LO(swapper_pg_dir)
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r24.H = #HI(swapper_pg_dir)
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/*
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* Symbol is kernel segment address, but we need
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* the logical/physical address.
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*/
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r25 = pc;
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r2.h = #0xffc0;
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r2.l = #0x0000;
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r25 = and(r2,r25); /* R25 holds PHYS_OFFSET now */
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r1.h = #HI(PAGE_OFFSET);
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r1.l = #LO(PAGE_OFFSET);
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r24 = sub(r24,r1); /* swapper_pg_dir - PAGE_OFFSET */
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r24 = add(r24,r25); /* + PHYS_OFFSET */
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r0 = r24; /* aka __pa(swapper_pg_dir) */
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/*
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* Initialize page dir to make the virtual and physical
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* addresses where the kernel was loaded be identical.
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* Done in 4MB chunks.
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*/
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#define PTE_BITS ( __HVM_PTE_R | __HVM_PTE_W | __HVM_PTE_X \
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| __HEXAGON_C_WB_L2 << 6 \
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| __HVM_PDE_S_4MB)
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/*
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* Get number of VA=PA entries; only really needed for jump
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* to hyperspace; gets blown away immediately after
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*/
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{
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r1.l = #LO(_end);
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r2.l = #LO(stext);
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r3 = #1;
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}
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{
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r1.h = #HI(_end);
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r2.h = #HI(stext);
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r3 = asl(r3, #22);
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}
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{
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r1 = sub(r1, r2);
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r3 = add(r3, #-1);
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} /* r1 = _end - stext */
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r1 = add(r1, r3); /* + (4M-1) */
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r26 = lsr(r1, #22); /* / 4M = # of entries */
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r1 = r25;
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r2.h = #0xffc0;
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r2.l = #0x0000; /* round back down to 4MB boundary */
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r1 = and(r1,r2);
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r2 = lsr(r1, #22) /* 4MB page number */
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r2 = asl(r2, #2) /* times sizeof(PTE) (4bytes) */
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r0 = add(r0,r2) /* r0 = address of correct PTE */
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r2 = #PTE_BITS
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r1 = add(r1,r2) /* r1 = 4MB PTE for the first entry */
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r2.h = #0x0040
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r2.l = #0x0000 /* 4MB increments */
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loop0(1f,r26);
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1:
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memw(r0 ++ #4) = r1
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{ r1 = add(r1, r2); } :endloop0
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/* Also need to overwrite the initial 0xc0000000 entries */
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/* PAGE_OFFSET >> (4MB shift - 4 bytes per entry shift) */
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R1.H = #HI(PAGE_OFFSET >> (22 - 2))
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R1.L = #LO(PAGE_OFFSET >> (22 - 2))
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r0 = add(r1, r24); /* advance to 0xc0000000 entry */
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r1 = r25;
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r2.h = #0xffc0;
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r2.l = #0x0000; /* round back down to 4MB boundary */
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r1 = and(r1,r2); /* for huge page */
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r2 = #PTE_BITS
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r1 = add(r1,r2);
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r2.h = #0x0040
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r2.l = #0x0000 /* 4MB increments */
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loop0(1f,SEGTABLE_ENTRIES);
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1:
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memw(r0 ++ #4) = r1;
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{ r1 = add(r1,r2); } :endloop0
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r0 = r24;
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/*
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* The subroutine wrapper around the virtual instruction touches
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* no memory, so we should be able to use it even here.
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* Note that in this version, R1 and R2 get "clobbered"; see
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* vm_ops.S
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*/
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r1 = #VM_TRANS_TYPE_TABLE
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call __vmnewmap;
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/* Jump into virtual address range. */
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r31.h = #hi(__head_s_vaddr_target)
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r31.l = #lo(__head_s_vaddr_target)
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jumpr r31
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/* Insert trippy space effects. */
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__head_s_vaddr_target:
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/*
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* Tear down VA=PA translation now that we are running
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* in kernel virtual space.
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*/
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r0 = #__HVM_PDE_S_INVALID
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r1.h = #0xffc0;
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r1.l = #0x0000;
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r2 = r25; /* phys_offset */
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r2 = and(r1,r2);
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r1.l = #lo(swapper_pg_dir)
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r1.h = #hi(swapper_pg_dir)
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r2 = lsr(r2, #22) /* 4MB page number */
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r2 = asl(r2, #2) /* times sizeof(PTE) (4bytes) */
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r1 = add(r1,r2);
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loop0(1f,r26)
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1:
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{
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memw(R1 ++ #4) = R0
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}:endloop0
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r0 = r24
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r1 = #VM_TRANS_TYPE_TABLE
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call __vmnewmap
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/* Go ahead and install the trap0 return so angel calls work */
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r0.h = #hi(_K_provisional_vec)
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r0.l = #lo(_K_provisional_vec)
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call __vmsetvec
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/*
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* OK, at this point we should start to be much more careful,
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* we're going to enter C code and start touching memory
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* in all sorts of places.
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* This means:
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* SGP needs to be OK
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* Need to lock shared resources
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* A bunch of other things that will cause
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* all kinds of painful bugs
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*/
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/*
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* Stack pointer should be pointed at the init task's
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* thread stack, which should have been declared in arch/init_task.c.
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* So uhhhhh...
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* It's accessible via the init_thread_union, which is a union
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* of a thread_info struct and a stack; of course, the top
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* of the stack is not for you. The end of the stack
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* is simply init_thread_union + THREAD_SIZE.
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*/
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{r29.H = #HI(init_thread_union); r0.H = #HI(_THREAD_SIZE); }
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{r29.L = #LO(init_thread_union); r0.L = #LO(_THREAD_SIZE); }
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/* initialize the register used to point to current_thread_info */
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/* Fixme: THREADINFO_REG can't be R2 because of that memset thing. */
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{r29 = add(r29,r0); THREADINFO_REG = r29; }
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/* Hack: zero bss; */
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{ r0.L = #LO(__bss_start); r1 = #0; r2.l = #LO(__bss_stop); }
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{ r0.H = #HI(__bss_start); r2.h = #HI(__bss_stop); }
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r2 = sub(r2,r0);
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call memset;
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/* Set PHYS_OFFSET; should be in R25 */
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#ifdef CONFIG_HEXAGON_PHYS_OFFSET
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r0.l = #LO(__phys_offset);
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r0.h = #HI(__phys_offset);
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memw(r0) = r25;
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#endif
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/* Time to make the doughnuts. */
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call start_kernel
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/*
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* Should not reach here.
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*/
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1:
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jump 1b
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.p2align PAGE_SHIFT
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ENTRY(external_cmdline_buffer)
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.fill _PAGE_SIZE,1,0
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.data
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.p2align PAGE_SHIFT
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ENTRY(empty_zero_page)
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.fill _PAGE_SIZE,1,0
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