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/* $OpenBSD: exec.c,v 1.14 2019/07/22 11:51:30 kettenis Exp $ */
/*
* Copyright (c) 2006, 2016 Mark Kettenis
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/reboot.h>
#include <dev/cons.h>
#include <lib/libkern/libkern.h>
#include <lib/libsa/loadfile.h>
#include <sys/exec_elf.h>
#include <efi.h>
#include <stand/boot/cmd.h>
#include <arm/armreg.h>
#include "efiboot.h"
#include "libsa.h"
typedef void (*startfuncp)(void *, void *, void *) __attribute__ ((noreturn));
#define CLIDR_LOC(x) ((x >> 24) & 0x7)
#define CLIDR_CTYPE(x, n) ((x >> (n * 3)) & 0x7)
#define CLIDR_CTYPE_NOCACHE 0x0
#define CLIDR_CTYPE_ICACHE 0x1
#define CLIDR_CTYPE_DCACHE 0x2
#define CLIDR_CTYPE_SEP_CACHE 0x3
#define CLIDR_CTYPE_UNI_CACHE 0x4
#define CCSIDR_NUMSETS(x) ((x >> 13) & 0x7fff)
#define CCSIDR_ASSOCIATIVITY(x) ((x >> 3) & 0x3ff)
#define CCSIDR_LINESZ(x) (x & 0x7)
void
dcache_wbinv_all(void)
{
uint32_t clidr;
uint32_t ccsidr;
uint32_t val;
int nways, nsets;
int wshift, sshift;
int way, set;
int level;
__asm volatile("mrc p15, 1, %0, c0, c0, 1" : "=r"(clidr));
for (level = 0; level < CLIDR_LOC(clidr); level++) {
if (CLIDR_CTYPE(clidr, level) == CLIDR_CTYPE_NOCACHE)
break;
if (CLIDR_CTYPE(clidr, level) == CLIDR_CTYPE_ICACHE)
continue;
__asm volatile("mcr p15, 2, %0, c0, c0, 0" :: "r"(level << 1));
__asm volatile("isb");
__asm volatile("mrc p15, 1, %0, c0, c0, 0" : "=r"(ccsidr));
nways = CCSIDR_ASSOCIATIVITY(ccsidr) + 1;
nsets = CCSIDR_NUMSETS(ccsidr) + 1;
sshift = CCSIDR_LINESZ(ccsidr) + 4;
wshift = __builtin_clz(CCSIDR_ASSOCIATIVITY(ccsidr));
for (way = 0; way < nways; way++) {
for (set = 0; set < nsets; set++) {
val = (way << wshift) | (set << sshift) |
(level << 1);
__asm volatile("mcr p15, 0, %0, c7, c14, 2"
:: "r"(val));
}
}
}
__asm volatile("dsb");
}
void
icache_inv_all(void)
{
__asm volatile("mcr p15, 0, r0, c7, c5, 0"); /* ICIALLU */
__asm volatile("dsb");
__asm volatile("isb");
}
void
dcache_disable(void)
{
uint32_t sctlr;
__asm volatile("mrc p15, 0, %0, c1, c0, 0" : "=r"(sctlr));
sctlr &= ~CPU_CONTROL_DC_ENABLE;
__asm volatile("mcr p15, 0, %0, c1, c0, 0" :: "r"(sctlr));
__asm volatile("dsb");
__asm volatile("isb");
}
void
icache_disable(void)
{
uint32_t sctlr;
__asm volatile("mrc p15, 0, %0, c1, c0, 0" : "=r"(sctlr));
sctlr &= ~CPU_CONTROL_IC_ENABLE;
__asm volatile("mcr p15, 0, %0, c1, c0, 0" :: "r"(sctlr));
__asm volatile("dsb");
__asm volatile("isb");
}
void
mmu_disable(void)
{
uint32_t sctlr;
__asm volatile("mrc p15, 0, %0, c1, c0, 0" : "=r"(sctlr));
sctlr &= ~CPU_CONTROL_MMU_ENABLE;
__asm volatile("mcr p15, 0, %0, c1, c0, 0" :: "r"(sctlr));
__asm volatile("mcr p15, 0, r0, c8, c7, 0"); /* TLBIALL */
__asm volatile("mcr p15, 0, r0, c7, c5, 6"); /* BPIALL */
__asm volatile("dsb");
__asm volatile("isb");
}
void
run_loadfile(uint64_t *marks, int howto)
{
Elf_Ehdr *elf = (Elf_Ehdr *)marks[MARK_SYM];
Elf_Shdr *shp = (Elf_Shdr *)(marks[MARK_SYM] + elf->e_shoff);
u_long esym = marks[MARK_END] & 0x0fffffff;
u_long offset = 0;
char args[256];
char *cp;
void *fdt;
uint32_t board_id = 0;
int i;
/*
* Tell locore.S where the symbol table ends by setting
* 'esym', which should be the first word in the .data
* section.
*/
for (i = 0; i < elf->e_shnum; i++) {
/* XXX Assume .data is the first writable segment. */
if (shp[i].sh_flags & SHF_WRITE) {
/* XXX We have to store the virtual address. */
esym |= shp[i].sh_addr & 0xf0000000;
*(u_long *)(LOADADDR(shp[i].sh_addr)) = esym;
break;
}
}
snprintf(args, sizeof(args) - 8, "%s:%s", cmd.bootdev, cmd.image);
cp = args + strlen(args);
*cp++ = ' ';
*cp = '-';
if (howto & RB_ASKNAME)
*++cp = 'a';
if (howto & RB_CONFIG)
*++cp = 'c';
if (howto & RB_SINGLE)
*++cp = 's';
if (howto & RB_KDB)
*++cp = 'd';
if (*cp == '-')
*--cp = 0;
else
*++cp = 0;
fdt = efi_makebootargs(args, &board_id);
efi_cleanup();
dcache_disable();
dcache_wbinv_all();
icache_disable();
icache_inv_all();
mmu_disable();
(*(startfuncp)(marks[MARK_ENTRY]))((void *)esym, (void *)board_id, fdt);
/* NOTREACHED */
}
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