Hexagon: Add startup code
Signed-off-by: Richard Kuo <rkuo@codeaurora.org> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Richard Kuo
Linus Torvalds
parent
4b30f9652e
commit
e03167b26b
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/*
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* Early kernel startup code for Hexagon
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*
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* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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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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__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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r24 = asl(r24, #2)
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r24 = lsr(r24, #2)
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r0 = r24
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/*
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* Initialize a 16MB PTE to make the virtual and physical
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* addresses where the kernel was loaded be identical.
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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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r1 = pc
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r2.H = #0xffc0
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r2.L = #0x0000
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r1 = and(r1,r2) /* round PC to 4MB boundary */
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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 */
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memw(r0 ++ #4) = r1
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r1 = add(r1, r2)
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memw(r0 ++ #4) = r1
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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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*/
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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 the desgnated kernel segments.
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*/
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r0 = #__HVM_PDE_S_INVALID
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r1 = r24
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loop0(1f,#0x100)
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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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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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/* 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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@ -0,0 +1,38 @@
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/*
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* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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#include <linux/smp.h>
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#include <asm/hexagon_vm.h>
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void machine_power_off(void)
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{
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smp_send_stop();
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__vmstop();
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}
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void machine_halt(void)
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{
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}
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void machine_restart(char *cmd)
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{
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}
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void pm_power_off(void)
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{
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}
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@ -0,0 +1,145 @@
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/*
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* Arch related setup for Hexagon
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*
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* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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#include <linux/init.h>
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#include <linux/bootmem.h>
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#include <linux/mmzone.h>
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#include <linux/mm.h>
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#include <linux/seq_file.h>
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#include <linux/console.h>
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#include <linux/of_fdt.h>
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#include <asm/io.h>
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#include <asm/sections.h>
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#include <asm/setup.h>
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#include <asm/processor.h>
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#include <asm/hexagon_vm.h>
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#include <asm/vm_mmu.h>
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#include <asm/time.h>
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#ifdef CONFIG_OF
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#include <asm/prom.h>
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#endif
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char cmd_line[COMMAND_LINE_SIZE];
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static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
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int on_simulator;
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void __cpuinit calibrate_delay(void)
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{
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loops_per_jiffy = thread_freq_mhz * 1000000 / HZ;
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}
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/*
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* setup_arch - high level architectural setup routine
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* @cmdline_p: pointer to pointer to command-line arguments
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*/
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void __init setup_arch(char **cmdline_p)
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{
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char *p = &external_cmdline_buffer;
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/*
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* These will eventually be pulled in via either some hypervisor
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* or devicetree description. Hardwiring for now.
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*/
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pcycle_freq_mhz = 600;
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thread_freq_mhz = 100;
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sleep_clk_freq = 32000;
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/*
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* Set up event bindings to handle exceptions and interrupts.
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*/
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__vmsetvec(_K_VM_event_vector);
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/*
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* Simulator has a few differences from the hardware.
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* For now, check uninitialized-but-mapped memory
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* prior to invoking setup_arch_memory().
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*/
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if (*(int *)((unsigned long)_end + 8) == 0x1f1f1f1f)
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on_simulator = 1;
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else
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on_simulator = 0;
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if (p[0] != '\0')
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strlcpy(boot_command_line, p, COMMAND_LINE_SIZE);
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else
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strlcpy(boot_command_line, default_command_line,
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COMMAND_LINE_SIZE);
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/*
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* boot_command_line and the value set up by setup_arch
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* are both picked up by the init code. If no reason to
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* make them different, pass the same pointer back.
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*/
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strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
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*cmdline_p = cmd_line;
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parse_early_param();
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setup_arch_memory();
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#ifdef CONFIG_SMP
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smp_start_cpus();
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#endif
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}
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/*
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* Functions for dumping CPU info via /proc
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* Probably should move to kernel/proc.c or something.
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*/
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static void *c_start(struct seq_file *m, loff_t *pos)
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{
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return *pos < nr_cpu_ids ? (void *)((unsigned long) *pos + 1) : NULL;
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}
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static void *c_next(struct seq_file *m, void *v, loff_t *pos)
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{
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++*pos;
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return c_start(m, pos);
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}
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static void c_stop(struct seq_file *m, void *v)
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{
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}
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/*
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* Eventually this will dump information about
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* CPU properties like ISA level, TLB size, etc.
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*/
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static int show_cpuinfo(struct seq_file *m, void *v)
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{
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int cpu = (unsigned long) v - 1;
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seq_printf(m, "processor\t: %d\n", cpu);
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seq_printf(m, "model name\t: Hexagon Virtual Machine\n");
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seq_printf(m, "BogoMips\t: %lu.%02lu\n",
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(loops_per_jiffy * HZ) / 500000,
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((loops_per_jiffy * HZ) / 5000) % 100);
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seq_printf(m, "\n");
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return 0;
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}
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const struct seq_operations cpuinfo_op = {
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.start = &c_start,
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.next = &c_next,
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.stop = &c_stop,
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.show = &show_cpuinfo,
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};
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