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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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387798b37c
This lets us build a multiplatform kernel for experimental purposes. However, it will not be useful for any real work, because it relies on a number of useful things to be disabled for now: * SMP support must be turned off because of conflicting symbols. Marc Zyngier has proposed a solution by adding a new SOC operations structure to hold indirect function pointers for these, but that work is currently stalled * We turn on SPARSE_IRQ unconditionally, which is not supported on most platforms. Each of them is currently in a different state, but most are being worked on. * A common clock framework is in place since v3.4 but not yet being used. Work on this is on its way. * DEBUG_LL for early debugging is currently disabled. * THUMB2_KERNEL does not work with allyesconfig because the kernel gets too big [Rob Herring]: Rebased to not be dependent on the mass mach header rename. As a result, omap2plus, imx, mxs and ux500 are not converted. Highbank, picoxcell, mvebu, and socfpga are converted. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Rob Herring <rob.herring@calxeda.com> Cc: Russell King <linux@arm.linux.org.uk> Cc: Jason Cooper <jason@lakedaemon.net> Cc: Andrew Lunn <andrew@lunn.ch> Acked-by: Jamie Iles <jamie@jamieiles.com> Cc: Dinh Nguyen <dinguyen@altera.com>
161 lines
3.0 KiB
C
161 lines
3.0 KiB
C
/*
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* misc.c
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*
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* This is a collection of several routines from gzip-1.0.3
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* adapted for Linux.
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*
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* malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
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*
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* Modified for ARM Linux by Russell King
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*
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* Nicolas Pitre <nico@visuaide.com> 1999/04/14 :
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* For this code to run directly from Flash, all constant variables must
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* be marked with 'const' and all other variables initialized at run-time
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* only. This way all non constant variables will end up in the bss segment,
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* which should point to addresses in RAM and cleared to 0 on start.
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* This allows for a much quicker boot time.
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*/
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unsigned int __machine_arch_type;
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#include <linux/compiler.h> /* for inline */
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#include <linux/types.h>
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#include <linux/linkage.h>
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static void putstr(const char *ptr);
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extern void error(char *x);
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#ifdef CONFIG_ARCH_MULTIPLATFORM
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static inline void putc(int c) {}
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static inline void flush(void) {}
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static inline void arch_decomp_setup(void) {}
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#else
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#include <mach/uncompress.h>
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#endif
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#ifdef CONFIG_DEBUG_ICEDCC
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#if defined(CONFIG_CPU_V6) || defined(CONFIG_CPU_V6K) || defined(CONFIG_CPU_V7)
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static void icedcc_putc(int ch)
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{
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int status, i = 0x4000000;
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do {
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if (--i < 0)
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return;
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asm volatile ("mrc p14, 0, %0, c0, c1, 0" : "=r" (status));
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} while (status & (1 << 29));
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asm("mcr p14, 0, %0, c0, c5, 0" : : "r" (ch));
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}
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#elif defined(CONFIG_CPU_XSCALE)
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static void icedcc_putc(int ch)
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{
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int status, i = 0x4000000;
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do {
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if (--i < 0)
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return;
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asm volatile ("mrc p14, 0, %0, c14, c0, 0" : "=r" (status));
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} while (status & (1 << 28));
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asm("mcr p14, 0, %0, c8, c0, 0" : : "r" (ch));
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}
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#else
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static void icedcc_putc(int ch)
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{
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int status, i = 0x4000000;
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do {
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if (--i < 0)
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return;
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asm volatile ("mrc p14, 0, %0, c0, c0, 0" : "=r" (status));
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} while (status & 2);
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asm("mcr p14, 0, %0, c1, c0, 0" : : "r" (ch));
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}
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#endif
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#define putc(ch) icedcc_putc(ch)
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#endif
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static void putstr(const char *ptr)
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{
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char c;
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while ((c = *ptr++) != '\0') {
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if (c == '\n')
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putc('\r');
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putc(c);
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}
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flush();
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}
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/*
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* gzip declarations
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*/
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extern char input_data[];
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extern char input_data_end[];
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unsigned char *output_data;
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unsigned long free_mem_ptr;
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unsigned long free_mem_end_ptr;
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#ifndef arch_error
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#define arch_error(x)
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#endif
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void error(char *x)
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{
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arch_error(x);
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putstr("\n\n");
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putstr(x);
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putstr("\n\n -- System halted");
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while(1); /* Halt */
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}
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asmlinkage void __div0(void)
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{
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error("Attempting division by 0!");
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}
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extern int do_decompress(u8 *input, int len, u8 *output, void (*error)(char *x));
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void
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decompress_kernel(unsigned long output_start, unsigned long free_mem_ptr_p,
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unsigned long free_mem_ptr_end_p,
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int arch_id)
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{
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int ret;
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output_data = (unsigned char *)output_start;
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free_mem_ptr = free_mem_ptr_p;
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free_mem_end_ptr = free_mem_ptr_end_p;
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__machine_arch_type = arch_id;
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arch_decomp_setup();
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putstr("Uncompressing Linux...");
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ret = do_decompress(input_data, input_data_end - input_data,
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output_data, error);
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if (ret)
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error("decompressor returned an error");
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else
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putstr(" done, booting the kernel.\n");
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}
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