提交 e03167b2 编写于 作者: R Richard Kuo 提交者: Linus Torvalds

Hexagon: Add startup code

Signed-off-by: NRichard Kuo <rkuo@codeaurora.org>
Acked-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
上级 4b30f965
/*
* 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
/*
* 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/smp.h>
#include <asm/hexagon_vm.h>
void machine_power_off(void)
{
smp_send_stop();
__vmstop();
}
void machine_halt(void)
{
}
void machine_restart(char *cmd)
{
}
void pm_power_off(void)
{
}
/*
* Arch related setup 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/init.h>
#include <linux/bootmem.h>
#include <linux/mmzone.h>
#include <linux/mm.h>
#include <linux/seq_file.h>
#include <linux/console.h>
#include <linux/of_fdt.h>
#include <asm/io.h>
#include <asm/sections.h>
#include <asm/setup.h>
#include <asm/processor.h>
#include <asm/hexagon_vm.h>
#include <asm/vm_mmu.h>
#include <asm/time.h>
#ifdef CONFIG_OF
#include <asm/prom.h>
#endif
char cmd_line[COMMAND_LINE_SIZE];
static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
int on_simulator;
void __cpuinit calibrate_delay(void)
{
loops_per_jiffy = thread_freq_mhz * 1000000 / HZ;
}
/*
* setup_arch - high level architectural setup routine
* @cmdline_p: pointer to pointer to command-line arguments
*/
void __init setup_arch(char **cmdline_p)
{
char *p = &external_cmdline_buffer;
/*
* These will eventually be pulled in via either some hypervisor
* or devicetree description. Hardwiring for now.
*/
pcycle_freq_mhz = 600;
thread_freq_mhz = 100;
sleep_clk_freq = 32000;
/*
* Set up event bindings to handle exceptions and interrupts.
*/
__vmsetvec(_K_VM_event_vector);
/*
* Simulator has a few differences from the hardware.
* For now, check uninitialized-but-mapped memory
* prior to invoking setup_arch_memory().
*/
if (*(int *)((unsigned long)_end + 8) == 0x1f1f1f1f)
on_simulator = 1;
else
on_simulator = 0;
if (p[0] != '\0')
strlcpy(boot_command_line, p, COMMAND_LINE_SIZE);
else
strlcpy(boot_command_line, default_command_line,
COMMAND_LINE_SIZE);
/*
* boot_command_line and the value set up by setup_arch
* are both picked up by the init code. If no reason to
* make them different, pass the same pointer back.
*/
strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
*cmdline_p = cmd_line;
parse_early_param();
setup_arch_memory();
#ifdef CONFIG_SMP
smp_start_cpus();
#endif
}
/*
* Functions for dumping CPU info via /proc
* Probably should move to kernel/proc.c or something.
*/
static void *c_start(struct seq_file *m, loff_t *pos)
{
return *pos < nr_cpu_ids ? (void *)((unsigned long) *pos + 1) : NULL;
}
static void *c_next(struct seq_file *m, void *v, loff_t *pos)
{
++*pos;
return c_start(m, pos);
}
static void c_stop(struct seq_file *m, void *v)
{
}
/*
* Eventually this will dump information about
* CPU properties like ISA level, TLB size, etc.
*/
static int show_cpuinfo(struct seq_file *m, void *v)
{
int cpu = (unsigned long) v - 1;
seq_printf(m, "processor\t: %d\n", cpu);
seq_printf(m, "model name\t: Hexagon Virtual Machine\n");
seq_printf(m, "BogoMips\t: %lu.%02lu\n",
(loops_per_jiffy * HZ) / 500000,
((loops_per_jiffy * HZ) / 5000) % 100);
seq_printf(m, "\n");
return 0;
}
const struct seq_operations cpuinfo_op = {
.start = &c_start,
.next = &c_next,
.stop = &c_stop,
.show = &show_cpuinfo,
};
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