4 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
11 * -Check if we are running on Simulator or on real hardware
12 * to skip certain things during boot on simulator
15 #include <asm/asm-offsets.h>
16 #include <asm/entry.h>
17 #include <linux/linkage.h>
18 #include <asm/arcregs.h>
22 .section .init.text, "ax",@progbits
23 .type stext, @function
26 ;-------------------------------------------------------------------
27 ; Don't clobber r0-r4 yet. It might have bootloader provided info
28 ;-------------------------------------------------------------------
30 sr @_int_vec_base_lds, [AUX_INTR_VEC_BASE]
33 ; Only Boot (Master) proceeds. Others wait in platform dependent way
34 ; IDENTITY Reg [ 3 2 1 0 ]
35 ; (cpu-id) ^^^ => Zero for UP ARC700
36 ; => #Core-ID if SMP (Master 0)
37 ; Note that non-boot CPUs might not land here if halt-on-reset and
38 ; instead breath life from @first_lines_of_secondary, but we still
39 ; need to make sure only boot cpu takes this path.
42 jnz arc_platform_smp_wait_to_boot
44 ; Clear BSS before updating any globals
53 ; r0 = [0] No uboot interaction, [1] cmdline in r2, [2] DTB in r2
54 ; r1 = magic number (board identity, unused as of now
55 ; r2 = pointer to uboot provided cmdline or external DTB in mem
56 ; These are handled later in setup_arch()
60 ; Identify if running on ISS vs Silicon
61 ; IDENTITY Reg [ 3 2 1 0 ]
62 ; (chip-id) ^^^^^ ==> 0xffff for ISS
68 st r4, [@running_on_hw]
70 ; setup "current" tsk and optionally cache it in dedicated r25
72 SET_CURR_TASK_ON_CPU r9, r0 ; r9 = tsk, r0 = scratch
74 ; setup stack (fp, sp)
77 ; tsk->thread_info is really a PAGE, whose bottom hoists stack
78 GET_TSK_STACK_BASE r9, sp ; r9 = tsk, sp = stack base(output)
80 j start_kernel ; "C" entry point
83 ;----------------------------------------------------------------
84 ; First lines of code run by secondary before jumping to 'C'
85 ;----------------------------------------------------------------
86 .section .text, "ax",@progbits
87 .type first_lines_of_secondary, @function
88 .globl first_lines_of_secondary
90 first_lines_of_secondary:
92 sr @_int_vec_base_lds, [AUX_INTR_VEC_BASE]
94 ; setup per-cpu idle task as "current" on this CPU
95 ld r0, [@secondary_idle_tsk]
96 SET_CURR_TASK_ON_CPU r0, r1
98 ; setup stack (fp, sp)
101 ; set it's stack base to tsk->thread_info bottom
102 GET_TSK_STACK_BASE r0, sp
104 j start_kernel_secondary