/* This file is part of the program psim.
- Copyright (C) 1994-1996, Andrew Cagney <cagney@highland.com.au>
+ Copyright (C) 1994-1997, Andrew Cagney <cagney@highland.com.au>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
/* DEVICE
+
memory - description of system memory
+
DESCRIPTION
+
This device describes the size and location of the banks of
physical memory within the simulation.
that can be used by OpenBoot client programs to manage the
allocation of physical memory.
+
PROPERTIES
+
reg = { <address> <size> } (required)
Each pair specify one bank of memory.
Each pair specifies a block of memory that is currently unallocated.
+
+ BUGS
+
+
+ OpenFirmware doesn't make it clear if, when releasing memory the
+ same address + size pair as was used during the claim should be
+ specified.
+
+ It is assumed that #size-cells and #address-cells for the parent
+ node of this device are both one i.e. an address or size can be
+ specified using a single memory cell (word).
+
+ Significant work will be required before the <<memory>> device can
+ support 64bit addresses (#address-cells equal two).
+
*/
typedef struct _memory_reg_spec {
- unsigned32 base;
- unsigned32 size;
+ unsigned_cell base;
+ unsigned_cell size;
} memory_reg_spec;
typedef struct _hw_memory_chunk hw_memory_chunk;
struct _hw_memory_chunk {
unsigned_word address;
unsigned_word size;
- unsigned_word alloc_address;
- unsigned_word alloc_size;
int available;
hw_memory_chunk *next;
};
while (chunk != NULL) {
if (chunk->available)
nr_available += 1;
+ ASSERT(chunk->next == NULL
+ || chunk->address < chunk->next->address);
+ ASSERT(chunk->next == NULL
+ || chunk->address + chunk->size == chunk->next->address);
chunk = chunk->next;
}
/* now create the available struct */
curr = 0;
while (chunk != NULL) {
if (chunk->available) {
- available[curr].base = H2BE_4(chunk->address);
- available[curr].size = H2BE_4(chunk->size);
+ available[curr].base = H2BE_cell(chunk->address);
+ available[curr].size = H2BE_cell(chunk->size);
curr += 1;
}
chunk = chunk->next;
hw_memory_init_address(device *me)
{
hw_memory_device *hw_memory = (hw_memory_device*)device_data(me);
- const device_property *reg = device_find_array_property(me, "reg");
- const memory_reg_spec *spec = reg->array;
- int nr_entries = reg->sizeof_array / sizeof(*spec);
-
- /* sanity check reg property */
- if ((reg->sizeof_array % sizeof(*spec)) != 0)
- error("devices/%s reg property of incorrect size\n", device_name(me));
/* free up any previous structures */
{
}
}
- /* count/allocate memory entries */
+ /* attach memory regions according to the "reg" property */
{
- hw_memory_chunk **curr_chunk = &hw_memory->heap;
- while (nr_entries > 0) {
- hw_memory_chunk *new_chunk = ZALLOC(hw_memory_chunk);
- new_chunk->address = BE2H_4(spec->base);
- new_chunk->size = BE2H_4(spec->size);
- new_chunk->available = 1;
+ int reg_nr;
+ reg_property_spec reg;
+ for (reg_nr = 0;
+ device_find_reg_array_property(me, "reg", reg_nr, ®);
+ reg_nr++) {
+ int i;
+ /* check that the entry meets restrictions */
+ for (i = 0; i < reg.address.nr_cells - 1; i++)
+ if (reg.address.cells[i] != 0)
+ device_error(me, "Only single celled addresses supported");
+ for (i = 0; i < reg.size.nr_cells - 1; i++)
+ if (reg.size.cells[i] != 0)
+ device_error(me, "Only single celled sizes supported");
+ /* attach the range */
device_attach_address(device_parent(me),
- device_name(me),
attach_raw_memory,
0 /*address space*/,
- new_chunk->address,
- new_chunk->size,
+ reg.address.cells[reg.address.nr_cells - 1],
+ reg.size.cells[reg.size.nr_cells - 1],
access_read_write_exec,
me);
- spec++;
- nr_entries--;
+ }
+ }
+
+ /* create the initial `available memory' data structure */
+ if (device_find_property(me, "available") != NULL) {
+ hw_memory_chunk **curr_chunk = &hw_memory->heap;
+ int cell_nr;
+ unsigned_cell dummy;
+ int nr_cells = device_find_integer_array_property(me, "available", 0, &dummy);
+ if ((nr_cells % 2) != 0)
+ device_error(me, "property \"available\" invalid - contains an odd number of cells");
+ for (cell_nr = 0;
+ cell_nr < nr_cells;
+ cell_nr += 2) {
+ hw_memory_chunk *new_chunk = ZALLOC(hw_memory_chunk);
+ device_find_integer_array_property(me, "available", cell_nr,
+ &new_chunk->address);
+ device_find_integer_array_property(me, "available", cell_nr + 1,
+ &new_chunk->size);
+ new_chunk->available = 1;
+ *curr_chunk = new_chunk;
+ curr_chunk = &new_chunk->next;
+ }
+ }
+ else {
+ hw_memory_chunk **curr_chunk = &hw_memory->heap;
+ int reg_nr;
+ reg_property_spec reg;
+ for (reg_nr = 0;
+ device_find_reg_array_property(me, "reg", reg_nr, ®);
+ reg_nr++) {
+ hw_memory_chunk *new_chunk;
+ new_chunk = ZALLOC(hw_memory_chunk);
+ new_chunk->address = reg.address.cells[reg.address.nr_cells - 1];
+ new_chunk->size = reg.size.cells[reg.size.nr_cells - 1];
+ new_chunk->available = 1;
*curr_chunk = new_chunk;
curr_chunk = &new_chunk->next;
}
return;
}
-static unsigned_word
+static int
hw_memory_instance_claim(device_instance *instance,
- unsigned_word address,
- unsigned_word size,
- unsigned_word alignment)
+ int n_stack_args,
+ unsigned_cell stack_args[/*n_stack_args*/],
+ int n_stack_returns,
+ unsigned_cell stack_returns[/*n_stack_returns*/])
{
hw_memory_device *hw_memory = device_instance_data(instance);
+ device *me = device_instance_device(instance);
+ int stackp = 0;
+ unsigned_word alignment;
+ unsigned_cell size;
+ unsigned_cell address;
hw_memory_chunk *chunk = NULL;
- DTRACE(memory, ("claim - address=0x%lx size=0x%lx alignment=%d\n",
- (unsigned long)address,
- (unsigned long)size,
- (int)alignment));
+
+ /* get the alignment from the stack */
+ if (n_stack_args < stackp + 1)
+ device_error(me, "claim - incorrect number of arguments (alignment missing)");
+ alignment = stack_args[stackp];
+ stackp++;
+
+ /* get the size from the stack */
+ {
+ int i;
+ int nr_cells = device_nr_size_cells(device_parent(me));
+ if (n_stack_args < stackp + nr_cells)
+ device_error(me, "claim - incorrect number of arguments (size missing)");
+ for (i = 0; i < nr_cells - 1; i++) {
+ if (stack_args[stackp] != 0)
+ device_error(me, "claim - multi-cell sizes not supported");
+ stackp++;
+ }
+ size = stack_args[stackp];
+ stackp++;
+ }
+
+ /* get the address from the stack */
+ {
+ int nr_cells = device_nr_address_cells(device_parent(me));
+ if (alignment != 0) {
+ if (n_stack_args != stackp) {
+ if (n_stack_args == stackp + nr_cells)
+ DTRACE(memory, ("claim - extra address argument ignored\n"));
+ else
+ device_error(me, "claim - incorrect number of arguments (optional addr)");
+ }
+ address = 0;
+ }
+ else {
+ int i;
+ if (n_stack_args != stackp + nr_cells)
+ device_error(me, "claim - incorrect number of arguments (addr missing)");
+ for (i = 0; i < nr_cells - 1; i++) {
+ if (stack_args[stackp] != 0)
+ device_error(me, "claim - multi-cell addresses not supported");
+ stackp++;
+ }
+ address = stack_args[stackp];
+ }
+ }
+
+ /* check that there is space for the result */
+ if (n_stack_returns != 0
+ && n_stack_returns != device_nr_address_cells(device_parent(me)))
+ device_error(me, "claim - invalid number of return arguments");
+
/* find a chunk candidate, either according to address or alignment */
if (alignment == 0) {
chunk = hw_memory->heap;
- while (chunk != NULL
- && (address+size) > (chunk->address+chunk->size))
+ while (chunk != NULL) {
+ if ((address + size) <= (chunk->address + chunk->size))
+ break;
chunk = chunk->next;
+ }
if (chunk == NULL || address < chunk->address || !chunk->available)
- error("hw_memory_instance_claim: failed to allocate @0x%lx, size %ld\n",
- (unsigned long)address, (unsigned long)size);
+ device_error(me, "failed to allocate %ld bytes at 0x%lx",
+ (unsigned long)size, (unsigned long)address);
+ DTRACE(memory, ("claim - address=0x%lx size=0x%lx\n",
+ (unsigned long)address,
+ (unsigned long)size));
}
else {
+ /* adjust the alignment so that it is a power of two */
+ unsigned_word align_mask = 1;
+ while (align_mask < alignment && align_mask != 0)
+ align_mask <<= 1;
+ if (align_mask == 0)
+ device_error(me, "alignment 0x%lx is to large", (unsigned long)alignment);
+ align_mask -= 1;
+ /* now find an aligned chunk that fits */
chunk = hw_memory->heap;
- while (chunk != NULL && chunk->size < size)
+ while (chunk != NULL) {
+ address = ((chunk->address + align_mask) & ~align_mask);
+ if ((chunk->available)
+ && (chunk->address + chunk->size >= address + size))
+ break;
chunk = chunk->next;
- if (chunk == NULL || FLOOR_PAGE(alignment-1) > 0)
- error("hw_memory_instance_claim: failed to allocate %ld, align %ld\n",
- (unsigned long)size, (unsigned long)size);
- address = chunk->address;
+ }
+ if (chunk == NULL)
+ device_error(me, "failed to allocate %ld bytes with alignment %ld",
+ (unsigned long)size, (unsigned long)alignment);
+ DTRACE(memory, ("claim - size=0x%lx alignment=%ld (0x%lx), address=0x%lx\n",
+ (unsigned long)size,
+ (unsigned long)alignment,
+ (unsigned long)alignment,
+ (unsigned long)address));
}
- /* break of a part before this memory if needed */
+
+ /* break off a bit before this chunk if needed */
ASSERT(address >= chunk->address);
- if (FLOOR_PAGE(address) > chunk->address) {
- hw_memory_chunk *last_chunk = chunk;
- /* insert a new earlier chunk */
- chunk = ZALLOC(hw_memory_chunk);
- chunk->next = last_chunk->next;
- last_chunk->next = chunk;
+ if (address > chunk->address) {
+ hw_memory_chunk *next_chunk = ZALLOC(hw_memory_chunk);
+ /* insert a new chunk */
+ next_chunk->next = chunk->next;
+ chunk->next = next_chunk;
/* adjust the address/size */
- chunk->address = FLOOR_PAGE(address);
- chunk->size = last_chunk->size - (chunk->address - last_chunk->address);
- last_chunk->size = chunk->address - last_chunk->address;
+ next_chunk->address = address;
+ next_chunk->size = chunk->address + chunk->size - next_chunk->address;
+ next_chunk->available = 1;
+ chunk->size = next_chunk->address - chunk->address;
+ /* make this new chunk the one to allocate */
+ chunk = next_chunk;
}
- ASSERT(FLOOR_PAGE(address) == chunk->address);
- /* break of a bit after this chunk if needed */
- if (ALIGN_PAGE(address+size) < chunk->address + chunk->size) {
+ ASSERT(address == chunk->address);
+
+ /* break off a bit after this chunk if needed */
+ ASSERT(address + size <= chunk->address + chunk->size);
+ if (address + size < chunk->address + chunk->size) {
hw_memory_chunk *next_chunk = ZALLOC(hw_memory_chunk);
/* insert it in to the list */
next_chunk->next = chunk->next;
chunk->next = next_chunk;
- next_chunk->available = 1;
/* adjust the address/size */
- next_chunk->address = ALIGN_PAGE(address+size);
+ next_chunk->address = address + size;
next_chunk->size = chunk->address + chunk->size - next_chunk->address;
+ next_chunk->available = 1;
chunk->size = next_chunk->address - chunk->address;
}
- ASSERT(ALIGN_PAGE(address+size) == chunk->address + chunk->size);
- /* now allocate it */
- chunk->alloc_address = address;
- chunk->alloc_size = size;
+ ASSERT(address + size == chunk->address + chunk->size);
+
+ /* now allocate/return it */
chunk->available = 0;
hw_memory_set_available(device_instance_device(instance), hw_memory);
- return address;
+ if (n_stack_returns > 0) {
+ int i;
+ for (i = 0; i < n_stack_returns - 1; i++)
+ stack_returns[i] = 0;
+ stack_returns[n_stack_returns - 1] = address;
+ }
+
+ return 0;
}
-static void
+
+static int
hw_memory_instance_release(device_instance *instance,
- unsigned_word address,
- unsigned_word length)
+ int n_stack_args,
+ unsigned_cell stack_args[/*n_stack_args*/],
+ int n_stack_returns,
+ unsigned_cell stack_returns[/*n_stack_returns*/])
{
hw_memory_device *hw_memory = device_instance_data(instance);
- hw_memory_chunk *chunk = hw_memory->heap;
+ device *me = device_instance_device(instance);
+ unsigned_word length;
+ unsigned_word address;
+ int stackp = 0;
+ hw_memory_chunk *chunk;
+
+ /* get the length from the stack */
+ {
+ int i;
+ int nr_cells = device_nr_size_cells(device_parent(me));
+ if (n_stack_args < stackp + nr_cells)
+ device_error(me, "release - incorrect number of arguments (length missing)");
+ for (i = 0; i < nr_cells - 1; i++) {
+ if (stack_args[stackp] != 0)
+ device_error(me, "release - multi-cell length not supported");
+ stackp++;
+ }
+ length = stack_args[stackp];
+ stackp++;
+ }
+
+ /* get the address from the stack */
+ {
+ int i;
+ int nr_cells = device_nr_address_cells(device_parent(me));
+ if (n_stack_args != stackp + nr_cells)
+ device_error(me, "release - incorrect number of arguments (addr missing)");
+ for (i = 0; i < nr_cells - 1; i++) {
+ if (stack_args[stackp] != 0)
+ device_error(me, "release - multi-cell addresses not supported");
+ stackp++;
+ }
+ address = stack_args[stackp];
+ }
+
+ /* returns ok */
+ if (n_stack_returns != 0)
+ device_error(me, "release - nonzero number of results");
+
+ /* try to free the corresponding memory chunk */
+ chunk = hw_memory->heap;
while (chunk != NULL) {
- if (chunk->alloc_address == address
- && chunk->alloc_size == length
- && chunk->available == 0) {
- /* free this chunk */
- chunk->available = 1;
- /* check for merge */
- chunk = hw_memory->heap;
- while (chunk != NULL) {
- if (chunk->available
- && chunk->next != NULL && chunk->next->available) {
- /* adjacent */
- hw_memory_chunk *delete = chunk->next;
- ASSERT(chunk->address + chunk->size == delete->address);
- chunk->size += delete->size;
- chunk->next = delete->next;
- zfree(delete);
- }
+ if (chunk->address == address
+ && chunk->size == length) {
+ /* an exact match */
+ if (chunk->available)
+ device_error(me, "memory chunk 0x%lx (size 0x%lx) already available",
+ (unsigned long)address,
+ (unsigned long)length);
+ else {
+ /* free this chunk */
+ DTRACE(memory, ("release - address=0x%lx, length=0x%lx\n",
+ (unsigned long) address,
+ (unsigned long) length));
+ chunk->available = 1;
+ break;
+ }
+ }
+ else if (chunk->address >= address
+ && chunk->address + chunk->size <= address + length) {
+ /* a sub region */
+ if (!chunk->available) {
+ DTRACE(memory, ("release - address=0x%lx, size=0x%lx within region 0x%lx length 0x%lx\n",
+ (unsigned long) chunk->address,
+ (unsigned long) chunk->size,
+ (unsigned long) address,
+ (unsigned long) length));
+ chunk->available = 1;
}
- /* update the corresponding property */
- hw_memory_set_available(device_instance_device(instance), hw_memory);
- return;
}
chunk = chunk->next;
}
- error("hw_memory_instance_release: Address 0x%lx, size %ld not found\n",
- (unsigned long)address, (unsigned long)length);
- /* FIXME - dump allocated */
- /* FIXME - dump arguments */
+ if (chunk == NULL) {
+ printf_filtered("warning: released chunks within region 0x%lx..0x%lx\n",
+ (unsigned long)address,
+ (unsigned long)(address + length - 1));
+ }
+
+ /* check for the chance to merge two adjacent available memory chunks */
+ chunk = hw_memory->heap;
+ while (chunk != NULL) {
+ if (chunk->available
+ && chunk->next != NULL && chunk->next->available) {
+ /* adjacent */
+ hw_memory_chunk *delete = chunk->next;
+ ASSERT(chunk->address + chunk->size == delete->address);
+ chunk->size += delete->size;
+ chunk->next = delete->next;
+ zfree(delete);
+ }
+ else {
+ chunk = chunk->next;
+ }
+ }
+
+ /* update the corresponding property */
+ hw_memory_set_available(device_instance_device(instance), hw_memory);
+
+ return 0;
}
+
+static device_instance_methods hw_memory_instance_methods[] = {
+ { "claim", hw_memory_instance_claim },
+ { "release", hw_memory_instance_release },
+ { NULL, },
+};
+
static device_instance_callbacks const hw_memory_instance_callbacks = {
hw_memory_instance_delete,
NULL /*read*/, NULL /*write*/, NULL /*seek*/,
- hw_memory_instance_claim, hw_memory_instance_release
+ hw_memory_instance_methods
};
static device_instance *
projects / deliverable / binutils-gdb.git / blobdiff