/* Helper for grub_claim_heap. */
static int
heap_init (grub_uint64_t addr, grub_uint64_t len, grub_memory_type_t type,
void *data)
{
unsigned long *total = data;
if (type != GRUB_MEMORY_AVAILABLE)
return 0;
if (grub_ieee1275_test_flag (GRUB_IEEE1275_FLAG_NO_PRE1_5M_CLAIM))
{
if (addr + len <= 0x180000)
return 0;
if (addr < 0x180000)
{
len = addr + len - 0x180000;
addr = 0x180000;
}
}
len -= 1; /* Required for some firmware. */
/* Never exceed HEAP_MAX_SIZE */
if (*total + len > HEAP_MAX_SIZE)
len = HEAP_MAX_SIZE - *total;
/* Avoid claiming anything above HEAP_MAX_ADDR, if possible. */
if ((addr < HEAP_MAX_ADDR) && /* if it's too late, don't bother */
(addr + len > HEAP_MAX_ADDR) && /* if it wasn't available anyway, don't bother */
(*total + (HEAP_MAX_ADDR - addr) > HEAP_MIN_SIZE)) /* only limit ourselves when we can afford to */
len = HEAP_MAX_ADDR - addr;
/* In theory, firmware should already prevent this from happening by not
listing our own image in /memory/available. The check below is intended
as a safeguard in case that doesn't happen. However, it doesn't protect
us from corrupting our module area, which extends up to a
yet-undetermined region above _end. */
if ((addr < (grub_addr_t) _end) && ((addr + len) > (grub_addr_t) _start))
{
grub_printf ("Warning: attempt to claim over our own code!\n");
len = 0;
}
if (len)
{
grub_err_t err;
/* Claim and use it. */
err = grub_claimmap (addr, len);
if (err)
return err;
grub_mm_init_region ((void *) (grub_addr_t) addr, len);
}
*total += len;
if (*total >= HEAP_MAX_SIZE)
return 1;
return 0;
}
static grub_addr_t
grub_linux_claimmap_iterate (grub_addr_t target, grub_size_t size,
grub_size_t align)
{
grub_addr_t found_addr = (grub_addr_t) -1;
auto int NESTED_FUNC_ATTR alloc_mem (grub_uint64_t addr, grub_uint64_t len,
grub_memory_type_t type);
int NESTED_FUNC_ATTR alloc_mem (grub_uint64_t addr, grub_uint64_t len,
grub_memory_type_t type)
{
grub_uint64_t end = addr + len;
addr = ALIGN_UP (addr, align);
target = ALIGN_UP (target, align);
/* Target above the memory chunk. */
if (type != GRUB_MEMORY_AVAILABLE || target > end)
return 0;
/* Target inside the memory chunk. */
if (target >= addr && target < end && size <= end - target)
{
if (grub_claimmap (target, size) == GRUB_ERR_NONE)
{
found_addr = target;
return 1;
}
grub_print_error ();
}
/* Target below the memory chunk. */
if (target < addr && addr + size <= end)
{
if (grub_claimmap (addr, size) == GRUB_ERR_NONE)
{
found_addr = addr;
return 1;
}
grub_print_error ();
}
return 0;
}
/* Claim some available memory in the first /memory node. */
static void grub_claim_heap (void)
{
unsigned long total = 0;
auto int NESTED_FUNC_ATTR heap_init (grub_uint64_t addr, grub_uint64_t len, grub_uint32_t type);
int NESTED_FUNC_ATTR heap_init (grub_uint64_t addr, grub_uint64_t len, grub_uint32_t type)
{
if (type != 1)
return 0;
if (grub_ieee1275_test_flag (GRUB_IEEE1275_FLAG_NO_PRE1_5M_CLAIM))
{
if (addr + len <= 0x180000)
return 0;
if (addr < 0x180000)
{
len = addr + len - 0x180000;
addr = 0x180000;
}
}
len -= 1; /* Required for some firmware. */
/* Never exceed HEAP_MAX_SIZE */
if (total + len > HEAP_MAX_SIZE)
len = HEAP_MAX_SIZE - total;
/* Avoid claiming anything above HEAP_MAX_ADDR, if possible. */
if ((addr < HEAP_MAX_ADDR) && /* if it's too late, don't bother */
(addr + len > HEAP_MAX_ADDR) && /* if it wasn't available anyway, don't bother */
(total + (HEAP_MAX_ADDR - addr) > HEAP_MIN_SIZE)) /* only limit ourselves when we can afford to */
len = HEAP_MAX_ADDR - addr;
/* In theory, firmware should already prevent this from happening by not
listing our own image in /memory/available. The check below is intended
as a safeguard in case that doesn't happen. However, it doesn't protect
us from corrupting our module area, which extends up to a
yet-undetermined region above _end. */
if ((addr < (grub_addr_t) _end) && ((addr + len) > (grub_addr_t) _start))
{
grub_printf ("Warning: attempt to claim over our own code!\n");
len = 0;
}
if (len)
{
/* Claim and use it. */
if (grub_claimmap (addr, len) < 0)
return grub_error (GRUB_ERR_OUT_OF_MEMORY,
"failed to claim heap at 0x%llx, len 0x%llx",
addr, len);
grub_mm_init_region ((void *) (grub_addr_t) addr, len);
}
total += len;
if (total >= HEAP_MAX_SIZE)
return 1;
return 0;
}
if (grub_ieee1275_test_flag (GRUB_IEEE1275_FLAG_CANNOT_INTERPRET))
heap_init (HEAP_MAX_ADDR - HEAP_MIN_SIZE, HEAP_MIN_SIZE, 1);
else
grub_machine_mmap_iterate (heap_init);
}