diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/hexagon/kernel/head.S')
| -rw-r--r-- | ANDROID_3.4.5/arch/hexagon/kernel/head.S | 162 |
1 files changed, 0 insertions, 162 deletions
diff --git a/ANDROID_3.4.5/arch/hexagon/kernel/head.S b/ANDROID_3.4.5/arch/hexagon/kernel/head.S deleted file mode 100644 index 8e6b8191..00000000 --- a/ANDROID_3.4.5/arch/hexagon/kernel/head.S +++ /dev/null @@ -1,162 +0,0 @@ -/* - * Early kernel startup code for Hexagon - * - * Copyright (c) 2010-2011, Code Aurora Forum. 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 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. - */ - -#include <linux/linkage.h> -#include <linux/init.h> -#include <asm/asm-offsets.h> -#include <asm/mem-layout.h> -#include <asm/vm_mmu.h> -#include <asm/page.h> - - __INIT -ENTRY(stext) - /* - * VMM will already have set up true vector page, MMU, etc. - * To set up initial kernel identity map, we have to pass - * the VMM a pointer to some canonical page tables. In - * this implementation, we're assuming that we've got - * them precompiled. Generate value in R24, as we'll need - * it again shortly. - */ - r24.L = #LO(swapper_pg_dir) - r24.H = #HI(swapper_pg_dir) - - /* - * Symbol is kernel segment address, but we need - * the logical/physical address. - */ - r24 = asl(r24, #2) - r24 = lsr(r24, #2) - - r0 = r24 - - /* - * Initialize a 16MB PTE to make the virtual and physical - * addresses where the kernel was loaded be identical. - */ -#define PTE_BITS ( __HVM_PTE_R | __HVM_PTE_W | __HVM_PTE_X \ - | __HEXAGON_C_WB_L2 << 6 \ - | __HVM_PDE_S_4MB) - - r1 = pc - r2.H = #0xffc0 - r2.L = #0x0000 - r1 = and(r1,r2) /* round PC to 4MB boundary */ - r2 = lsr(r1, #22) /* 4MB page number */ - r2 = asl(r2, #2) /* times sizeof(PTE) (4bytes) */ - r0 = add(r0,r2) /* r0 = address of correct PTE */ - r2 = #PTE_BITS - r1 = add(r1,r2) /* r1 = 4MB PTE for the first entry */ - r2.h = #0x0040 - r2.l = #0x0000 /* 4MB */ - memw(r0 ++ #4) = r1 - r1 = add(r1, r2) - memw(r0 ++ #4) = r1 - - r0 = r24 - - /* - * The subroutine wrapper around the virtual instruction touches - * no memory, so we should be able to use it even here. - */ - call __vmnewmap; - - /* Jump into virtual address range. */ - - r31.h = #hi(__head_s_vaddr_target) - r31.l = #lo(__head_s_vaddr_target) - jumpr r31 - - /* Insert trippy space effects. */ - -__head_s_vaddr_target: - /* - * Tear down VA=PA translation now that we are running - * in the desgnated kernel segments. - */ - r0 = #__HVM_PDE_S_INVALID - r1 = r24 - loop0(1f,#0x100) -1: - { - memw(R1 ++ #4) = R0 - }:endloop0 - - r0 = r24 - call __vmnewmap - - /* Go ahead and install the trap0 return so angel calls work */ - r0.h = #hi(_K_provisional_vec) - r0.l = #lo(_K_provisional_vec) - call __vmsetvec - - /* - * OK, at this point we should start to be much more careful, - * we're going to enter C code and start touching memory - * in all sorts of places. - * This means: - * SGP needs to be OK - * Need to lock shared resources - * A bunch of other things that will cause - * all kinds of painful bugs - */ - - /* - * Stack pointer should be pointed at the init task's - * thread stack, which should have been declared in arch/init_task.c. - * So uhhhhh... - * It's accessible via the init_thread_union, which is a union - * of a thread_info struct and a stack; of course, the top - * of the stack is not for you. The end of the stack - * is simply init_thread_union + THREAD_SIZE. - */ - - {r29.H = #HI(init_thread_union); r0.H = #HI(_THREAD_SIZE); } - {r29.L = #LO(init_thread_union); r0.L = #LO(_THREAD_SIZE); } - - /* initialize the register used to point to current_thread_info */ - /* Fixme: THREADINFO_REG can't be R2 because of that memset thing. */ - {r29 = add(r29,r0); THREADINFO_REG = r29; } - - /* Hack: zero bss; */ - { r0.L = #LO(__bss_start); r1 = #0; r2.l = #LO(__bss_stop); } - { r0.H = #HI(__bss_start); r2.h = #HI(__bss_stop); } - - r2 = sub(r2,r0); - call memset; - - /* Time to make the doughnuts. */ - call start_kernel - - /* - * Should not reach here. - */ -1: - jump 1b - -.p2align PAGE_SHIFT -ENTRY(external_cmdline_buffer) - .fill _PAGE_SIZE,1,0 - -.data -.p2align PAGE_SHIFT -ENTRY(empty_zero_page) - .fill _PAGE_SIZE,1,0 |