linux/arch/nios2/kernel/setup.c
Arnd Bergmann fd90410e9d vgacon, arch/*: remove unused screen_info definitions
A number of architectures either kept the screen_info definition for
historical purposes as it used to be required by the generic VT code, or
they copied it from another architecture in order to build the VGA console
driver in an allmodconfig build. The mips definition is used by some
platforms, but the initialization on jazz is not needed.

Now that vgacon no longer builds on these architectures, remove the
stale definitions and initializations.

Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Acked-by: Dinh Nguyen <dinguyen@kernel.org>
Acked-by: Max Filippov <jcmvbkbc@gmail.com>
Acked-by: Palmer Dabbelt <palmer@rivosinc.com>
Acked-by: Guo Ren <guoren@kernel.org>
Acked-by: Helge Deller <deller@gmx.de>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20231009211845.3136536-5-arnd@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-10-17 10:17:02 +02:00

193 lines
4.4 KiB
C

/*
* Nios2-specific parts of system setup
*
* Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch>
* Copyright (C) 2004 Microtronix Datacom Ltd.
* Copyright (C) 2001 Vic Phillips <vic@microtronix.com>
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/export.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/sched/task.h>
#include <linux/console.h>
#include <linux/memblock.h>
#include <linux/initrd.h>
#include <linux/of_fdt.h>
#include <asm/mmu_context.h>
#include <asm/sections.h>
#include <asm/setup.h>
#include <asm/cpuinfo.h>
unsigned long memory_start;
EXPORT_SYMBOL(memory_start);
unsigned long memory_end;
EXPORT_SYMBOL(memory_end);
static struct pt_regs fake_regs = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0,
0};
/* Copy a short hook instruction sequence to the exception address */
static inline void copy_exception_handler(unsigned int addr)
{
unsigned int start = (unsigned int) exception_handler_hook;
volatile unsigned int tmp = 0;
if (start == addr) {
/* The CPU exception address already points to the handler. */
return;
}
__asm__ __volatile__ (
"ldw %2,0(%0)\n"
"stw %2,0(%1)\n"
"ldw %2,4(%0)\n"
"stw %2,4(%1)\n"
"ldw %2,8(%0)\n"
"stw %2,8(%1)\n"
"flushd 0(%1)\n"
"flushd 4(%1)\n"
"flushd 8(%1)\n"
"flushi %1\n"
"addi %1,%1,4\n"
"flushi %1\n"
"addi %1,%1,4\n"
"flushi %1\n"
"flushp\n"
: /* no output registers */
: "r" (start), "r" (addr), "r" (tmp)
: "memory"
);
}
/* Copy the fast TLB miss handler */
static inline void copy_fast_tlb_miss_handler(unsigned int addr)
{
unsigned int start = (unsigned int) fast_handler;
unsigned int end = (unsigned int) fast_handler_end;
volatile unsigned int tmp = 0;
__asm__ __volatile__ (
"1:\n"
" ldw %3,0(%0)\n"
" stw %3,0(%1)\n"
" flushd 0(%1)\n"
" flushi %1\n"
" flushp\n"
" addi %0,%0,4\n"
" addi %1,%1,4\n"
" bne %0,%2,1b\n"
: /* no output registers */
: "r" (start), "r" (addr), "r" (end), "r" (tmp)
: "memory"
);
}
/*
* save args passed from u-boot, called from head.S
*
* @r4: NIOS magic
* @r5: initrd start
* @r6: initrd end or fdt
* @r7: kernel command line
*/
asmlinkage void __init nios2_boot_init(unsigned r4, unsigned r5, unsigned r6,
unsigned r7)
{
unsigned dtb_passed = 0;
char cmdline_passed[COMMAND_LINE_SIZE] __maybe_unused = { 0, };
#if defined(CONFIG_NIOS2_PASS_CMDLINE)
if (r4 == 0x534f494e) { /* r4 is magic NIOS */
#if defined(CONFIG_BLK_DEV_INITRD)
if (r5) { /* initramfs */
initrd_start = r5;
initrd_end = r6;
}
#endif /* CONFIG_BLK_DEV_INITRD */
dtb_passed = r6;
if (r7)
strscpy(cmdline_passed, (char *)r7, COMMAND_LINE_SIZE);
}
#endif
early_init_devtree((void *)dtb_passed);
#ifndef CONFIG_CMDLINE_FORCE
if (cmdline_passed[0])
strscpy(boot_command_line, cmdline_passed, COMMAND_LINE_SIZE);
#ifdef CONFIG_NIOS2_CMDLINE_IGNORE_DTB
else
strscpy(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
#endif
#endif
parse_early_param();
}
static void __init find_limits(unsigned long *min, unsigned long *max_low,
unsigned long *max_high)
{
*max_low = PFN_DOWN(memblock_get_current_limit());
*min = PFN_UP(memblock_start_of_DRAM());
*max_high = PFN_DOWN(memblock_end_of_DRAM());
}
void __init setup_arch(char **cmdline_p)
{
console_verbose();
memory_start = memblock_start_of_DRAM();
memory_end = memblock_end_of_DRAM();
setup_initial_init_mm(_stext, _etext, _edata, _end);
init_task.thread.kregs = &fake_regs;
/* Keep a copy of command line */
*cmdline_p = boot_command_line;
find_limits(&min_low_pfn, &max_low_pfn, &max_pfn);
max_mapnr = max_low_pfn;
memblock_reserve(__pa_symbol(_stext), _end - _stext);
#ifdef CONFIG_BLK_DEV_INITRD
if (initrd_start) {
memblock_reserve(virt_to_phys((void *)initrd_start),
initrd_end - initrd_start);
}
#endif /* CONFIG_BLK_DEV_INITRD */
early_init_fdt_reserve_self();
early_init_fdt_scan_reserved_mem();
unflatten_and_copy_device_tree();
setup_cpuinfo();
copy_exception_handler(cpuinfo.exception_addr);
mmu_init();
copy_fast_tlb_miss_handler(cpuinfo.fast_tlb_miss_exc_addr);
/*
* Initialize MMU context handling here because data from cpuinfo is
* needed for this.
*/
mmu_context_init();
/*
* get kmalloc into gear
*/
paging_init();
}