From 8c2bece89fccb52882343be5e88b09a0d28a57a3 Mon Sep 17 00:00:00 2001 From: Ben Gras Date: Mon, 21 Sep 2009 14:39:15 +0000 Subject: [PATCH] - remove unused kmalloc - initial implementation of _read_host_time_ns, a function to retrieve real-time in ns in vmware virtual machines --- lib/sysutil/Makefile.in | 1 - lib/sysutil/kmalloc.c | 177 ------------------------------------------------ lib/sysutil/read_tsc.s | 22 ++++++ 3 files changed, 22 insertions(+), 178 deletions(-) delete mode 100755 lib/sysutil/kmalloc.c diff --git a/lib/sysutil/Makefile.in b/lib/sysutil/Makefile.in index a44addf98..cd9f53252 100644 --- a/lib/sysutil/Makefile.in +++ b/lib/sysutil/Makefile.in @@ -6,7 +6,6 @@ LIBRARIES=libsys libsys_FILES=" \ asynsend.c \ - kmalloc.c \ kprintf.c \ kputc.c \ tickdelay.c \ diff --git a/lib/sysutil/kmalloc.c b/lib/sysutil/kmalloc.c deleted file mode 100755 index b9ed72c53..000000000 --- a/lib/sysutil/kmalloc.c +++ /dev/null @@ -1,177 +0,0 @@ -/* malloc(), realloc(), free() - simple memory allocation routines - * - * This is a very small and simple minded malloc Author: Kees J. Bot - * implementation. Ideal for things like a 29 Jan 1994 - * bootstrap program, or for debugging. Six times - * slower than any good malloc. - */ -#define nil 0 - -#define sbrk _sbrk -#include -#include -#include -#include -#include -#if !DEBUG -#define NDEBUG 1 -#define debug(expr) ((void) 0) -#else -#define debug(expr) expr -#endif -#include - -typedef struct cell { - size_t size; /* Size of a malloc()'ed object. */ -#if DEBUG - unsigned magic; /* To recognize a cell. */ -#endif - struct cell *next; /* Next cell on the free list. */ -#if DEBUG - unsigned sacred; /* Don't touch while unallocated. */ -#endif -} cell_t; - -#if UINT_MAX <= 0xFFFF -#define MAGIC 0x537B -#else -#define MAGIC 0x537BC0D8 -#endif - -/* Size of the header of an object. */ -#define HDR_SIZE offsetof(cell_t, next) - -/* An offset from a cell pointer to a next cell. */ -#define offset(cp, size) ((cell_t *) ((char *) (cp) + (size))) - -/* Address of the object in a cell and back. */ -#define cell2obj(cp) ((void *) ((char *) (cp) + HDR_SIZE)) -#define obj2cell(op) ((cell_t *) ((char *) (op) - HDR_SIZE)) - -/* The free list. */ -static cell_t *freelist; - -void *malloc(size_t size) -/* Allocate an object of at least the given size. */ -{ - cell_t **pcp, *cp; - - size += HDR_SIZE; - if (size < sizeof(cell_t)) size= sizeof(cell_t); - - /* Align to a word. Use a real malloc if you need better alignment. */ - size= (size + sizeof(int) - 1) & ~(sizeof(int) - 1); - - /* Space for a magic number at the end of the chunk. */ - debug(size += sizeof(unsigned)); - - for (;;) { - /* Do a first fit search. */ - pcp= &freelist; - while ((cp= *pcp) != nil) { - cell_t *next= cp->next; - - assert(cp->magic == MAGIC); - assert(cp->sacred == MAGIC); - - if (offset(cp, cp->size) == next) { - /* Join adjacent free cells. */ - assert(next->magic == MAGIC); - assert(next->sacred == MAGIC); - - cp->size+= next->size; - cp->next= next->next; - - continue; /* Try again. */ - } - if (size <= cp->size) break; /* Big enough. */ - - /* Next cell. */ - pcp= &cp->next; - } - - if (cp != nil) break; /* Found a big enough chunk. */ - - /* Allocate a new chunk at the break. */ - if ((cp= (cell_t *) sbrk(size)) == (cell_t *) -1) { - return nil; - } - - cp->size= size; - cp->next= nil; - debug(cp->magic= MAGIC); - debug(cp->sacred= MAGIC); - *pcp= cp; - } - - /* We've got a cell that is big enough. Can we break it up? */ - if (cp->size >= size + sizeof(cell_t)) { - cell_t *next= offset(cp, size); - - next->size= cp->size - size; - next->next= cp->next; - debug(next->magic= MAGIC); - debug(next->sacred= MAGIC); - cp->size= size; - cp->next= next; - } - - /* Unchain the cell we've found and return an address in it. */ - *pcp= cp->next; - debug(memset(cell2obj(cp), 0xAA, cp->size - HDR_SIZE)); - debug(((unsigned *) offset(cp, cp->size))[-1]= MAGIC); - - return cell2obj(cp); -} - -void free(void *op) -/* Deallocate an object. */ -{ - cell_t **prev, *next, *cp; - - if (op == nil) return; /* Aaargh. */ - - cp= obj2cell(op); - assert(cp->magic == MAGIC); - assert(((unsigned *) offset(cp, cp->size))[-1] == MAGIC); - debug(cp->sacred= MAGIC); - - /* Find the spot where the object belongs. */ - prev= &freelist; - while ((next= *prev) != nil && next < cp) { - assert(next->magic == MAGIC); - assert(next->sacred == MAGIC); - prev= &next->next; - } - - /* Put the new free cell in the list. */ - *prev= cp; - cp->next= next; - -#if DEBUG - /* Check the rest of the list. */ - while (next != nil) { - assert(next->magic == MAGIC); - assert(next->sacred == MAGIC); - next= next->next; - } -#endif -} - -void *realloc(void *op, size_t size) -/* Change the size of an object. Don't bother being smart, just copy it. */ -{ - size_t oldsize; - void *new; - - oldsize= op == nil ? 0 : obj2cell(op)->size - HDR_SIZE; - - new= malloc(size); - memcpy(new, op, oldsize > size ? size : oldsize); - free(op); - return new; -} - -/* - * $PchId: malloc.c,v 1.4 1996/02/22 09:15:56 philip Exp $ - */ diff --git a/lib/sysutil/read_tsc.s b/lib/sysutil/read_tsc.s index 4b8a4d08c..94bd0e58d 100644 --- a/lib/sysutil/read_tsc.s +++ b/lib/sysutil/read_tsc.s @@ -25,3 +25,25 @@ _read_tsc: pop edx ret +!*===========================================================================* +! PUBLIC void read_host_time_ns(unsigned long *high, unsigned long *low); +! access real time in ns from host in vmware. +.align 16 +_read_host_time_ns: + push edx + push eax + push ecx + mov ecx, 0x10001 +.data1 0x0f ! this is the RDPMC instruction +.data1 0x33 ! it places the result in EDX:EAX + push ebp + mov ebp, 20(esp) + mov (ebp), edx + mov ebp, 24(esp) + mov (ebp), eax + pop ebp + pop ecx + pop eax + pop edx + ret + -- 2.11.4.GIT