Changeset 701 for trunk/softs/tsar_boot/include

Timestamp:

May 25, 2014, 5:35:37 PM (10 years ago)

Author:

cfuguet

Message:

tsar_boot:

• Important optimization in the reset_elf_loader function.

• Implementation of pread function which uses bytes addressing to read disk.

• pread function alternates between direct tranfer from disk to memory and from disk to a memory cache block based on alignment of byte address, i.e., when file offset is aligned to disk block (512 bytes), pread uses DMA capacity of disk to transfer directly to memory, otherwise it passes before by a memory cache block and then performs a memcpy to transfer data to final destination.

• the cache block used by pread function, allows to treat succeeding reads on the same block without accessing the disk.

Location:

trunk/softs/tsar_boot/include

Files:

• defs.h (modified) (1 diff)
• reset_utils.h (modified) (1 diff)

trunk/softs/tsar_boot/include/defs.h

@@ -5 +5 @@
 #define RESET_STACKS_SIZE   0x11000  /* 64 bytes * 1024 + 4 Kbytes (for P0) = 68 Kbytes */
 #define BOOT_LOADER_LBA     2
-#define PHDR_ARRAY_SIZE     16
+#define PHDR_ARRAY_SIZE     16
 
+#define BLOCK_SIZE          512
+
+// vim: tabstop=4 : softtabstop=4 : shiftwidth=4 : expandtab
+

trunk/softs/tsar_boot/include/reset_utils.h

@@ -10 +10 @@
 #include <elf-types.h>
 #include <reset_tty.h>
-#include <defs_platform.h>
+#include <reset_ioc.h>
+#include <defs.h>
 #include <mcc.h>
 #include <io.h>
 
+/********************************************************************
+ * Integer types definition
+ ********************************************************************/
+typedef unsigned int size_t;
+typedef unsigned int addr_t;
+
+/********************************************************************
+ * Other types definition
+ ********************************************************************/
+
+/*
+ * cache line aligned disk block (sector) buffer 
+ */
+struct aligned_blk
+{
+    char b[BLOCK_SIZE];
+} __attribute__((aligned(CACHE_LINE_SIZE)));
+
+/********************************************************************
+ * Utility functions definition
+ ********************************************************************/
+
 extern unsigned int proctime();
 
-extern void* memcpy(void *_dst, const void *_src, unsigned int size);
+extern int pread(size_t file_offset, void *buf, size_t nbyte, size_t offset);
 
-extern void* memset(void *_dst, const int value, unsigned int size);
+extern void* memcpy(void *_dst, const void *_src, size_t n);
+extern void* memset(void *_dst, int c, size_t len);
 
+extern void check_elf_header(Elf32_Ehdr *ehdr);
 extern void reset_print_elf_phdr(Elf32_Phdr * elf_phdr_ptr);
 
 #if USE_IOB
-void reset_mcc_invalidate ( const void * buffer,
-                            unsigned int size);
+void reset_mcc_invalidate (const void * buf, size_t size);
 #endif /* USE_IOB */
 
 #if (CACHE_COHERENCE == 0) || USE_IOB
-void reset_buf_invalidate ( const void * buffer,
-                            unsigned int line_size,
-                            unsigned int size);
+void reset_buf_invalidate (const void * buf, size_t line_size, size_t size);
 #endif /* (CACHE_COHERENCE == 0) || USE_IOB */
 #endif /* BOOT_UTILS_H */