mirror of
https://github.com/torvalds/linux.git
synced 2024-11-24 21:21:41 +00:00
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
162
arch/hexagon/kernel/head.S
Normal file
162
arch/hexagon/kernel/head.S
Normal file
@ -0,0 +1,162 @@
|
||||
/*
|
||||
* 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
|
||||
38
arch/hexagon/kernel/reset.c
Normal file
38
arch/hexagon/kernel/reset.c
Normal file
@ -0,0 +1,38 @@
|
||||
/*
|
||||
* 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)
|
||||
{
|
||||
}
|
||||
145
arch/hexagon/kernel/setup.c
Normal file
145
arch/hexagon/kernel/setup.c
Normal file
@ -0,0 +1,145 @@
|
||||
/*
|
||||
* 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,
|
||||
};
|
||||
Loading…
Reference in New Issue
Block a user