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/** @addtogroup libc
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/** @addtogroup libc
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 * @{
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 * @{
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 */
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 */
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/** @file
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/** @file
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 */
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 */
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#include <as.h>
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#include <as.h>
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#include <libc.h>
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#include <libc.h>
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#include <unistd.h>
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#include <unistd.h>
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#include <align.h>
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#include <align.h>
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#include <sys/types.h>
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#include <sys/types.h>
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#include <bitops.h>
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#include <bitops.h>
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#include <malloc.h>
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/**
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 * Either 4*256M on 32-bit architecures or 16*256M on 64-bit architectures.
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/** Last position allocated by as_get_mappable_page */
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 */
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#define MAX_HEAP_SIZE   (sizeof(uintptr_t)<<28)
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static uintptr_t last_allocated = 0;
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/** Create address space area.
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/** Create address space area.
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 *
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 *
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 * @param address Virtual address where to place new address space area.
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 * @param address Virtual address where to place new address space area.
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 * @param size Size of the area.
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 * @param size    Size of the area.
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 * @param flags Flags describing type of the area.
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 * @param flags   Flags describing type of the area.
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 *
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 *
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 * @return address on success, (void *) -1 otherwise.
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 * @return address on success, (void *) -1 otherwise.
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 *
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 */
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 */
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void *as_area_create(void *address, size_t size, int flags)
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void *as_area_create(void *address, size_t size, int flags)
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{
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{
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    return (void *) __SYSCALL3(SYS_AS_AREA_CREATE, (sysarg_t ) address,
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    return (void *) __SYSCALL3(SYS_AS_AREA_CREATE, (sysarg_t) address,
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        (sysarg_t) size, (sysarg_t) flags);
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        (sysarg_t) size, (sysarg_t) flags);
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}
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}
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/** Resize address space area.
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/** Resize address space area.
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 *
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 *
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 * @param address Virtual address pointing into already existing address space
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 * @param address Virtual address pointing into already existing address space
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 *  area.
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 *                area.
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 * @param size New requested size of the area.
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 * @param size    New requested size of the area.
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 * @param flags Currently unused.
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 * @param flags   Currently unused.
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 *
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 * @return zero on success or a code from @ref errno.h on failure.
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 *
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 *
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 * @return Zero on success or a code from @ref errno.h on failure.
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 */
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 */
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int as_area_resize(void *address, size_t size, int flags)
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int as_area_resize(void *address, size_t size, int flags)
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{
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{
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    return __SYSCALL3(SYS_AS_AREA_RESIZE, (sysarg_t ) address,
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    return __SYSCALL3(SYS_AS_AREA_RESIZE, (sysarg_t) address,
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        (sysarg_t) size, (sysarg_t) flags);
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        (sysarg_t) size, (sysarg_t) flags);
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}
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}
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/** Destroy address space area.
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/** Destroy address space area.
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 *
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 *
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 * @param address Virtual address pointing into the address space area being
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 * @param address Virtual address pointing into the address space area being
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 *  destroyed.
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 *                destroyed.
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 *
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 * @return zero on success or a code from @ref errno.h on failure.
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 *
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 *
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 * @return Zero on success or a code from @ref errno.h on failure.
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 */
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 */
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int as_area_destroy(void *address)
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int as_area_destroy(void *address)
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{
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{
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    return __SYSCALL1(SYS_AS_AREA_DESTROY, (sysarg_t ) address);
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    return __SYSCALL1(SYS_AS_AREA_DESTROY, (sysarg_t) address);
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}
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}
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/** Change address-space area flags.
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/** Change address-space area flags.
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 *
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 *
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 * @param address Virtual address pointing into the address space area being
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 * @param address Virtual address pointing into the address space area being
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 *  modified.
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 *                modified.
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 * @param flags New flags describing type of the area.
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 * @param flags   New flags describing type of the area.
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 *
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 * @return zero on success or a code from @ref errno.h on failure.
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 *
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 *
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 * @return Zero on success or a code from @ref errno.h on failure.
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 */
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 */
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int as_area_change_flags(void *address, int flags)
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int as_area_change_flags(void *address, int flags)
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{
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{
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    return __SYSCALL2(SYS_AS_AREA_CHANGE_FLAGS, (sysarg_t) address,
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    return __SYSCALL2(SYS_AS_AREA_CHANGE_FLAGS, (sysarg_t) address,
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        (sysarg_t) flags);
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        (sysarg_t) flags);
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}
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}
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static size_t heapsize = 0;
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static size_t maxheapsize = (size_t) (-1);
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static void * last_allocated = 0;
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/* Start of heap linker symbol */
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extern char _heap;
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/** Sbrk emulation
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 *
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 * @param incr New area that should be allocated or negative,
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               if it should be shrinked
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 * @return Pointer to newly allocated area
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 */
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void *sbrk(ssize_t incr)
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{
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    int rc;
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    void *res;
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    /* Check for invalid values */
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    if (incr < 0 && -incr > heapsize)
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        return NULL;
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    /* Check for too large value */
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    if (incr > 0 && incr+heapsize < heapsize)
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        return NULL;
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    /* Check for too small values */
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    if (incr < 0 && incr+heapsize > heapsize)
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        return NULL;
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    /* Check for user limit */
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    if ((maxheapsize != (size_t) (-1)) && (heapsize + incr) > maxheapsize)
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        return NULL;
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    rc = as_area_resize(&_heap, heapsize + incr, 0);
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    if (rc != 0)
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        return NULL;
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    /* Compute start of new area */
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    res = (void *) &_heap + heapsize;
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    heapsize += incr;
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    return res;
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}
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/** Set maximum heap size and return pointer just after the heap */
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void *set_maxheapsize(size_t mhs)
-
 
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{
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    maxheapsize = mhs;
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    /* Return pointer to area not managed by sbrk */
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    return ((void *) &_heap + maxheapsize);
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}
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/** Return pointer to some unmapped area, where fits new as_area
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/** Return pointer to some unmapped area, where fits new as_area
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 *
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 *
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 * @param sz Requested size of the allocation.
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 * @param size Requested size of the allocation.
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 *
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 *
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 * @return Pointer to the beginning
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 * @return pointer to the beginning
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 *
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 *
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 * TODO: make some first_fit/... algorithm, we are now just incrementing
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 *       the pointer to last area
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 */
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 */
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void *as_get_mappable_page(size_t sz)
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void *as_get_mappable_page(size_t size)
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{
113
{
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    void *res;
114
    if (size == 0)
169
    uint64_t asz;
115
        return NULL;
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    int i;
-
 
171
   
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172
    if (!sz)
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        return NULL;   
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-
 
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    asz = 1 << (fnzb64(sz - 1) + 1);
117
    size_t sz = 1 << (fnzb(size - 1) + 1);
176
 
-
 
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    /* Set heapsize to some meaningful value */
-
 
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    if (maxheapsize == -1)
118
    if (last_allocated == 0)
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        set_maxheapsize(MAX_HEAP_SIZE);
119
        last_allocated = get_max_heap_addr();
180
   
120
   
181
    /*
121
    /*
182
     * Make sure we allocate from naturally aligned address.
122
     * Make sure we allocate from naturally aligned address.
183
     */
123
     */
184
    i = 0;
-
 
185
    if (!last_allocated) {
-
 
186
        last_allocated = (void *) ALIGN_UP((void *) &_heap +
-
 
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            maxheapsize, asz);
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188
    } else {
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189
        last_allocated = (void *) ALIGN_UP(((uintptr_t)
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            last_allocated) + (int) (i > 0), asz);
-
 
191
    }
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192
 
-
 
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    res = last_allocated;
124
    uintptr_t res = ALIGN_UP(last_allocated, sz);
194
    last_allocated += ALIGN_UP(sz, PAGE_SIZE);
125
    last_allocated = res + ALIGN_UP(size, PAGE_SIZE);
195
 
126
   
196
    return res;
127
    return ((void *) res);
197
}
128
}
198
 
129
 
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/** @}
130
/** @}
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 */
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 */