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loader: start kernel in text mode when there is no vbefb vt driver

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If kernel is built without VT vbefb driver, make sure
we start kernel in text mode.
This commit is contained in:
Toomas Soome 2021-01-27 00:47:56 +02:00
parent 93ebd6307e
commit 6c7a932d0b
4 changed files with 74 additions and 9 deletions
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1
stand/common/gfx_fb.h
View File

@ -204,6 +204,7 @@ typedef struct teken_gfx {
struct gen_fb tg_fb;
teken_funcs_t *tg_functions;
void *tg_private;
bool tg_kernel_supported; /* Loaded kernel is supported */
} teken_gfx_t;
extern font_list_t fonts;

63
stand/common/load_elf.c
View File

@ -39,6 +39,7 @@ __FBSDID("$FreeBSD$");
#include <stand.h>
#define FREEBSD_ELF
#include <sys/link_elf.h>
#include <gfx_fb.h>
#include "bootstrap.h"
@ -84,12 +85,14 @@ typedef struct elf_file {
static int __elfN(loadimage)(struct preloaded_file *mp, elf_file_t ef,
uint64_t loadaddr);
static int __elfN(lookup_symbol)(struct preloaded_file *mp, elf_file_t ef,
const char* name, Elf_Sym* sym);
static int __elfN(lookup_symbol)(elf_file_t ef, const char* name,
Elf_Sym *sym, unsigned char type);
static int __elfN(reloc_ptr)(struct preloaded_file *mp, elf_file_t ef,
Elf_Addr p, void *val, size_t len);
static int __elfN(parse_modmetadata)(struct preloaded_file *mp, elf_file_t ef,
Elf_Addr p_start, Elf_Addr p_end);
static bool __elfN(parse_vt_drv_set)(struct preloaded_file *mp, elf_file_t ef,
Elf_Addr p_start, Elf_Addr p_end);
static symaddr_fn __elfN(symaddr);
static char *fake_modname(const char *name);
@ -872,12 +875,24 @@ __elfN(loadimage)(struct preloaded_file *fp, elf_file_t ef, uint64_t off)
ef->buckets = ef->hashtab + 2;
ef->chains = ef->buckets + ef->nbuckets;
if (__elfN(lookup_symbol)(fp, ef, "__start_set_modmetadata_set",
&sym) != 0)
gfx_state.tg_kernel_supported = false;
if (__elfN(lookup_symbol)(ef, "__start_set_vt_drv_set", &sym,
STT_NOTYPE) == 0) {
p_start = sym.st_value + ef->off;
if (__elfN(lookup_symbol)(ef, "__stop_set_vt_drv_set", &sym,
STT_NOTYPE) == 0) {
p_end = sym.st_value + ef->off;
gfx_state.tg_kernel_supported =
__elfN(parse_vt_drv_set)(fp, ef, p_start, p_end);
}
}
if (__elfN(lookup_symbol)(ef, "__start_set_modmetadata_set", &sym,
STT_NOTYPE) != 0)
return 0;
p_start = sym.st_value + ef->off;
if (__elfN(lookup_symbol)(fp, ef, "__stop_set_modmetadata_set",
&sym) != 0)
if (__elfN(lookup_symbol)(ef, "__stop_set_modmetadata_set", &sym,
STT_NOTYPE) != 0)
return ENOENT;
p_end = sym.st_value + ef->off;
@ -1072,6 +1087,36 @@ __elfN(load_modmetadata)(struct preloaded_file *fp, uint64_t dest)
return (err);
}
/*
* Walk through vt_drv_set, each vt driver structure starts with
* static 16 chars for driver name. If we have "vbefb", return true.
*/
static bool
__elfN(parse_vt_drv_set)(struct preloaded_file *fp, elf_file_t ef,
Elf_Addr p_start, Elf_Addr p_end)
{
Elf_Addr v, p;
char vd_name[16];
int error;
p = p_start;
while (p < p_end) {
COPYOUT(p, &v, sizeof(v));
error = __elfN(reloc_ptr)(fp, ef, p, &v, sizeof(v));
if (error == EOPNOTSUPP)
v += ef->off;
else if (error != 0)
return (false);
COPYOUT(v, &vd_name, sizeof(vd_name));
if (strncmp(vd_name, "vbefb", sizeof(vd_name)) == 0)
return (true);
p += sizeof(Elf_Addr);
}
return (false);
}
int
__elfN(parse_modmetadata)(struct preloaded_file *fp, elf_file_t ef,
Elf_Addr p_start, Elf_Addr p_end)
@ -1185,8 +1230,8 @@ elf_hash(const char *name)
static const char __elfN(bad_symtable)[] = "elf" __XSTRING(__ELF_WORD_SIZE)
"_lookup_symbol: corrupt symbol table\n";
int
__elfN(lookup_symbol)(struct preloaded_file *fp, elf_file_t ef,
const char* name, Elf_Sym *symp)
__elfN(lookup_symbol)(elf_file_t ef, const char* name, Elf_Sym *symp,
unsigned char type)
{
Elf_Hashelt symnum;
Elf_Sym sym;
@ -1213,7 +1258,7 @@ __elfN(lookup_symbol)(struct preloaded_file *fp, elf_file_t ef,
free(strp);
if (sym.st_shndx != SHN_UNDEF ||
(sym.st_value != 0 &&
ELF_ST_TYPE(sym.st_info) == STT_FUNC)) {
ELF_ST_TYPE(sym.st_info) == type)) {
*symp = sym;
return 0;
}

10
stand/i386/libi386/bootinfo.c
View File

@ -41,6 +41,16 @@ __FBSDID("$FreeBSD$");
void
bi_load_vbe_data(struct preloaded_file *kfp)
{
if (!gfx_state.tg_kernel_supported) {
/*
* Loaded kernel does not have vt/vbe backend,
* switch console to text mode.
*/
if (vbe_available())
bios_set_text_mode(VGA_TEXT_MODE);
return;
}
if (vbe_available()) {
file_addmetadata(kfp, MODINFOMD_VBE_FB,
sizeof(gfx_state.tg_fb), &gfx_state.tg_fb);

9
stand/loader.mk
View File

@ -17,23 +17,32 @@ CFLAGS.pnglite.c+= -DHAVE_MEMCPY -I${SRCTOP}/sys/contrib/zlib
.if ${MACHINE} == "i386" || ${MACHINE_CPUARCH} == "amd64"
SRCS+= load_elf32.c load_elf32_obj.c reloc_elf32.c
SRCS+= load_elf64.c load_elf64_obj.c reloc_elf64.c
CFLAGS.load_elf32.c += -I$(SRCTOP)/sys/teken -I${SRCTOP}/contrib/pnglite
CFLAGS.load_elf64.c += -I$(SRCTOP)/sys/teken -I${SRCTOP}/contrib/pnglite
.elif ${MACHINE_CPUARCH} == "aarch64"
SRCS+= load_elf64.c reloc_elf64.c
CFLAGS.load_elf64.c += -I$(SRCTOP)/sys/teken -I${SRCTOP}/contrib/pnglite
.elif ${MACHINE_CPUARCH} == "arm"
SRCS+= load_elf32.c reloc_elf32.c
CFLAGS.load_elf32.c += -I$(SRCTOP)/sys/teken -I${SRCTOP}/contrib/pnglite
.elif ${MACHINE_CPUARCH} == "powerpc"
SRCS+= load_elf32.c reloc_elf32.c
SRCS+= load_elf64.c reloc_elf64.c
SRCS+= metadata.c
CFLAGS.load_elf32.c += -I$(SRCTOP)/sys/teken -I${SRCTOP}/contrib/pnglite
CFLAGS.load_elf64.c += -I$(SRCTOP)/sys/teken -I${SRCTOP}/contrib/pnglite
.elif ${MACHINE_ARCH:Mmips64*} != ""
SRCS+= load_elf64.c reloc_elf64.c
SRCS+= metadata.c
CFLAGS.load_elf64.c += -I$(SRCTOP)/sys/teken -I${SRCTOP}/contrib/pnglite
.elif ${MACHINE} == "mips"
SRCS+= load_elf32.c reloc_elf32.c
SRCS+= metadata.c
CFLAGS.load_elf32.c += -I$(SRCTOP)/sys/teken -I${SRCTOP}/contrib/pnglite
.elif ${MACHINE_CPUARCH} == "riscv"
SRCS+= load_elf64.c reloc_elf64.c
SRCS+= metadata.c
CFLAGS.load_elf64.c += -I$(SRCTOP)/sys/teken -I${SRCTOP}/contrib/pnglite
.endif
.if ${LOADER_DISK_SUPPORT:Uyes} == "yes"