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riscv: bring in the configstring parsing functions from UCB 

I've tested this with commits to come later.

This is from the lowrisc bbl distribution, 87588c4,
with fixes so it builds.

Change-Id: I87893638872259c94d6972e1971578b633155e7e
Signed-off-by: Ronald G. Minnich <rminnich@gmail.com>
Reviewed-on: https://review.coreboot.org/17255
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
This commit is contained in:
Ronald G. Minnich 2016-11-06 20:51:18 -08:00
parent 96b3c6f937
commit 04c94ded3a
2 changed files with 263 additions and 0 deletions
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54
src/commonlib/configstring.c Normal file
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/*
* Copyright (c) 2013-2016, The Regents of the University of California
*(Regents).
* All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Regents nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* IN NO EVENT SHALL REGENTS BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT,
* SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS,
* ARISING
* OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF REGENTS HAS
* BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* REGENTS SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE. THE SOFTWARE AND ACCOMPANYING DOCUMENTATION, IF ANY, PROVIDED
* HEREUNDER IS PROVIDED "AS IS". REGENTS HAS NO OBLIGATION TO PROVIDE
* MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*/
#include <config.h>
#include <assert.h>
#include <string.h>
#include <commonlib/configstring.h>
void query_mem(const char *config_string, uintptr_t *base, size_t *size)
{
query_result res = query_config_string(config_string, "ram{0{addr");
*base = get_uint(res);
res = query_config_string(config_string, "ram{0{size");
*size = get_uint(res);
}
/* query_rtc returns the physical address of the rtc. */
void query_rtc(const char *config_string, uintptr_t *mtime)
{
query_result res = query_config_string(config_string, "rtc{addr");
*mtime = (uintptr_t)get_uint(res);
}
const char *configstring(void)
{
uint32_t addr = *(uint32_t *)CONFIG_ARCH_CONFIGSTRING_RISCV;
return (const char *)(uintptr_t)addr;
}

209
src/commonlib/include/commonlib/configstring.h Normal file
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/*
* Copyright (c) 2013-2016, The Regents of the University of California
*(Regents).
* All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Regents nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* IN NO EVENT SHALL REGENTS BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT,
* SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS,
* ARISING
* OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF REGENTS HAS
* BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* REGENTS SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE. THE SOFTWARE AND ACCOMPANYING DOCUMENTATION, IF ANY, PROVIDED
* HEREUNDER IS PROVIDED "AS IS". REGENTS HAS NO OBLIGATION TO PROVIDE
* MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*/
#ifndef RISCV_CONFIG_STRING_H
#define RISCV_CONFIG_STRING_H
#include <stddef.h>
#include <stdint.h>
static const char *skip_whitespace(const char *str)
{
while (*str && *str <= ' ')
str++;
return str;
}
static const char *skip_string(const char *str)
{
while (*str && *str++ != '"')
;
return str;
}
static int is_hex(char ch)
{
return (ch >= '0' && ch <= '9') || (ch >= 'a' && ch <= 'f') ||
(ch >= 'A' && ch <= 'F');
}
static int parse_hex(char ch)
{
return (ch >= '0' && ch <= '9') ? ch - '0' : (ch >= 'a' && ch <= 'f')
? ch - 'a' + 10
: ch - 'A' + 10;
}
static const char *skip_key(const char *str)
{
while (*str >= 35 && *str <= 122 && *str != ';')
str++;
return str;
}
typedef struct {
const char *start;
const char *end;
} query_result;
static inline query_result query_config_string(const char *str, const char *k)
{
size_t ksize = 0;
while (k[ksize] && k[ksize] != '{')
ksize++;
int last = !k[ksize];
query_result res = {0, 0};
while (1) {
const char *key_start = str = skip_whitespace(str);
const char *key_end = str = skip_key(str);
int match = (size_t)(key_end - key_start) == ksize;
if (match)
for (size_t i = 0; i < ksize; i++)
if (key_start[i] != k[i])
match = 0;
const char *value_start = str = skip_whitespace(str);
while (*str != ';') {
if (!*str) {
return res;
} else if (*str == '"') {
str = skip_string(str + 1);
} else if (*str == '{') {
const char *search_key =
match && !last ? k + ksize + 1 : "";
query_result inner_res =
query_config_string(str + 1, search_key);
if (inner_res.start)
return inner_res;
str = inner_res.end + 1;
} else {
str = skip_key(str);
}
str = skip_whitespace(str);
}
res.end = str;
if (match && last) {
res.start = value_start;
return res;
}
str = skip_whitespace(str + 1);
if (*str == '}') {
res.end = str;
return res;
}
}
}
static void parse_string(query_result r, char *buf)
{
if (r.start < r.end) {
if (*r.start == '"') {
for (const char *p = r.start + 1;
p < r.end && *p != '"'; p++) {
char ch = p[0];
if (ch == '\\' && p[1] == 'x' && is_hex(p[2])) {
ch = parse_hex(p[2]);
if (is_hex(p[3])) {
ch =
(ch << 4) + parse_hex(p[3]);
p++;
}
p += 2;
}
*buf++ = ch;
}
} else {
for (const char *p = r.start; p < r.end && *p > ' ';
p++)
*buf++ = *p;
}
}
*buf = 0;
}
static uint64_t __get_uint_hex(const char *s)
{
uint64_t res = 0;
while (*s) {
if (is_hex(*s))
res = (res << 4) + parse_hex(*s);
else if (*s != '_')
break;
s++;
}
return res;
}
static uint64_t __get_uint_dec(const char *s)
{
uint64_t res = 0;
while (*s) {
if (*s >= '0' && *s <= '9')
res = res * 10 + (*s - '0');
else
break;
s++;
}
return res;
}
static uint64_t __get_uint(const char *s)
{
if (s[0] == '0' && s[1] == 'x')
return __get_uint_hex(s + 2);
return __get_uint_dec(s);
}
// This is nasty. But the original code used a much nastier thing,
// an array declared as an automatic, which triggered gcc warnings
// as it was sized by the res.end - res.start. We'll need a better
// solution, long term. Malloc is probably not it.
static char name[1024];
static inline uint64_t get_uint(query_result res)
{
uint64_t v;
parse_string(res, name);
v = __get_uint(name);
return v;
}
static inline int64_t get_sint(query_result res)
{
int64_t v;
parse_string(res, name);
if (name[0] == '-')
return -__get_uint(name + 1);
v = __get_uint(name);
return v;
}
const char *configstring(void);
void query_mem(const char *config_string, uintptr_t *base, size_t *size);
void query_rtc(const char *config_string, uintptr_t *mtime);
#endif