[RFC] ELF Relocatable x86 and x86_64 bzImages

"Eric W. Biederman" <ebiederm.DeleteThis@xmission.com> writes:
> }
> @@ -200,6 +224,178 @@ static void putstr(const char *s)
> outb_p(0xff & (pos >> 1), vidport+1);
> }
>
> +static void vid_console_init(void)

Please just use early_printk instead of reimplementing this.
I think it should work in this context too.

> +static inline int tolower(int ch)
> +{
> + return ch | 0x20;
> +}
> +
> +static inline int isdigit(int ch)
> +{
> + return (ch >= '0') && (ch <= '9');
> +}
> +
> +static inline int isxdigit(int ch)
> +{
> + ch = tolower(ch);
> + return isdigit(ch) || ((ch >= 'a') && (ch <= 'f'));
> +}

And please reuse the Linux code here.


Actually the best way to reuse would be to first do 64bit uncompressor
and linker directly, but short of that #includes would be fine too.


> +
> +
> +static inline int digval(int ch)
> +{
> + return isdigit(ch)? (ch - '0') : tolower(ch) - 'a' + 10;
> +}
> +
> +/**
> + * simple_strtou - convert a string to an unsigned
> + * @cp: The start of the string
> + * @endp: A pointer to the end of the parsed string will be placed here
> + * @base: The number base to use
> + */
> +static unsigned simple_strtou(const char *cp, char **endp, unsigned base)
> +{
> + unsigned result = 0,value;
> +
> + if (!base) {
> + base = 10;
> + if (*cp == '0') {
> + base = 8;
> + cp++;
> + if ((tolower(*cp) == 'x') && isxdigit(cp[1])) {
> + cp++;
> + base = 16;
> + }
> + }
> + } else if (base == 16) {
> + if (cp[0] == '0' && tolower(cp[1]) == 'x')
> + cp += 2;
> + }
> + while (isxdigit(*cp) && ((value = digval(*cp)) < base)) {
> + result = result*base + value;
> + cp++;
> + }
> + if (endp)
> + *endp = (char *)cp;
> + return result;
> +}

Can you please somehow reuse the Linux one?

> +
> static void* memset(void* s, int c, unsigned n)
> {
> int i;
> @@ -218,6 +414,29 @@ static void* memcpy(void* dest, const vo
> return dest;
> }
>
> +static int memcmp(const void *s1, const void *s2, unsigned n)
> +{
> + const unsigned char *str1 = s1, *str2 = s2;
> + size_t i;
> + int result = 0;
> + for(i = 0; (result == 0) && (i < n); i++) {
> + result = *str1++ - *str2++;
> + }
> + return result;
> +}
> +
> +char *strstr(const char *haystack, const char *needle)
> +{
> + size_t len;
> + len = strlen(needle);
> + while(*haystack) {
> + if (memcmp(haystack, needle, len) == 0)
> + return (char *)haystack;
> + haystack++;
> + }
> + return NULL;


Would be better to just pull in lib/string.c

-Andi

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"Eric W. Biederman" <ebiederm.RemoveThis@xmission.com> writes:

> With the rewrite of the SMP trampoline and the early page
> allocator there is nothing that needs identity mapped pages,
> once we start executing C code.

Cool.

Hopefully that can be done for i386 too. People on other architectures
have been complaining that i386 doesn't catch early NULL pointers.

-Andi
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