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Diffstat (limited to 'src/devices/oprom/yabel/pmm.c')
-rw-r--r--src/devices/oprom/yabel/pmm.c442
1 files changed, 442 insertions, 0 deletions
diff --git a/src/devices/oprom/yabel/pmm.c b/src/devices/oprom/yabel/pmm.c
new file mode 100644
index 0000000000..ad4dc6834c
--- /dev/null
+++ b/src/devices/oprom/yabel/pmm.c
@@ -0,0 +1,442 @@
+/****************************************************************************
+ * YABEL BIOS Emulator
+ *
+ * This program and the accompanying materials
+ * are made available under the terms of the BSD License
+ * which accompanies this distribution, and is available at
+ * http://www.opensource.org/licenses/bsd-license.php
+ *
+ * Copyright (c) 2008 Pattrick Hueper <phueper@hueper.net>
+ ****************************************************************************/
+
+#include <x86emu/x86emu.h>
+#include "../x86emu/prim_ops.h"
+#include <string.h>
+
+#include "biosemu.h"
+#include "pmm.h"
+#include "debug.h"
+#include "device.h"
+
+/* this struct is used to remember which PMM spaces
+ * have been assigned. MAX_PMM_AREAS defines how many
+ * PMM areas we can assign.
+ * All areas are assigned in PMM_CONV_SEGMENT
+ */
+typedef struct {
+ u32 handle; /* handle that is returned to PMM caller */
+ u32 offset; /* in PMM_CONV_SEGMENT */
+ u32 length; /* length of this area */
+} pmm_allocation_t;
+
+#define MAX_PMM_AREAS 10
+
+/* array to store the above structs */
+static pmm_allocation_t pmm_allocation_array[MAX_PMM_AREAS];
+
+/* index into pmm_allocation_array */
+static u32 curr_pmm_allocation_index = 0;
+
+/* This function is used to setup the PMM struct in virtual memory
+ * at a certain offset, the length of the PMM struct is returned */
+u8 pmm_setup(u16 segment, u16 offset)
+{
+ /* setup the PMM structure */
+ pmm_information_t *pis =
+ (pmm_information_t *) (M.mem_base + (((u32) segment) << 4) +
+ offset);
+ memset(pis, 0, sizeof(pmm_information_t));
+ /* set signature to $PMM */
+ pis->signature[0] = '$';
+ pis->signature[1] = 'P';
+ pis->signature[2] = 'M';
+ pis->signature[3] = 'M';
+ /* revision as specified */
+ pis->struct_rev = 0x01;
+ /* internal length, excluding code */
+ pis->length = ((void *)&(pis->code) - (void *)&(pis->signature));
+ /* the code to be executed, pointed to by entry_point_offset */
+ pis->code[0] = 0xCD; /* INT */
+ pis->code[1] = PMM_INT_NUM; /* my selfdefined PMM INT number */
+ pis->code[2] = 0xCB; /* RETF */
+ /* set the entry_point_offset, it should point to pis->code, segment is the segment of
+ * this struct. Since pis->length is the length of the struct excluding code, offset+pis->length
+ * points to the code... it's that simple ;-)
+ */
+ out32le(&(pis->entry_point_offset),
+ (u32) segment << 16 | (u32) (offset + pis->length));
+ /* checksum calculation */
+ u8 i;
+ u8 checksum = 0;
+ for (i = 0; i < pis->length; i++) {
+ checksum += *(((u8 *) pis) + i);
+ }
+ pis->checksum = ((u8) 0) - checksum;
+ CHECK_DBG(DEBUG_PMM) {
+ DEBUG_PRINTF_PMM("PMM Structure:\n");
+ dump((void *)pis, sizeof(pmm_information_t));
+ }
+ return sizeof(pmm_information_t);
+}
+
+/* handle the selfdefined interrupt, this is executed, when the PMM Entry Point
+ * is executed, it must handle all PMM requests
+ */
+void pmm_handleInt()
+{
+ u32 rval = 0;
+ u16 function, flags;
+ u32 handle, length;
+ u32 i, j;
+ u32 buffer;
+ /* !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+ * according to the PMM Spec "the flags and all registers, except DX and AX
+ * are preserved across calls to PMM"
+ * so we save M.x86 and in :exit label we restore it, however, this means that no
+ * returns must be used in this function, any exit must use goto exit!
+ * !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+ */
+ X86EMU_regs backup_regs = M.x86;
+ pop_long(); /* pop the return address, this is already saved in INT handler, we don't need
+ to remember this. */
+ function = pop_word();
+ switch (function) {
+ case 0:
+ /* function pmmAllocate */
+ length = pop_long();
+ length *= 16; /* length is passed in "paragraphs" of 16 bytes each */
+ handle = pop_long();
+ flags = pop_word();
+ DEBUG_PRINTF_PMM
+ ("%s: pmmAllocate: Length: %x, Handle: %x, Flags: %x\n",
+ __func__, length, handle, flags);
+ if ((flags & 0x1) != 0) {
+ /* request to allocate in conventional memory */
+ if (curr_pmm_allocation_index >= MAX_PMM_AREAS) {
+ printf
+ ("%s: pmmAllocate: Maximum Number of allocatable areas reached (%d), cannot allocate more memory!\n",
+ __func__, MAX_PMM_AREAS);
+ rval = 0;
+ goto exit;
+ }
+ /* some ROMs seem to be confused by offset 0, so lets start at 0x100 */
+ u32 next_offset = 0x100;
+ pmm_allocation_t *pmm_alloc =
+ &(pmm_allocation_array[curr_pmm_allocation_index]);
+ if (curr_pmm_allocation_index != 0) {
+ /* we have already allocated... get the new next_offset
+ * from the previous pmm_allocation_t */
+ next_offset =
+ pmm_allocation_array
+ [curr_pmm_allocation_index - 1].offset +
+ pmm_allocation_array
+ [curr_pmm_allocation_index - 1].length;
+ }
+ DEBUG_PRINTF_PMM("%s: next_offset: 0x%x\n",
+ __func__, next_offset);
+ if (length == 0) {
+ /* largest possible block size requested, we have on segment
+ * to allocate, so largest possible is segment size (0xFFFF)
+ * minus next_offset
+ */
+ rval = 0xFFFF - next_offset;
+ goto exit;
+ }
+ u32 align = 0;
+ if (((flags & 0x4) != 0) && (length > 0)) {
+ /* align to least significant bit set in length param */
+ u8 lsb = 0;
+ while (((length >> lsb) & 0x1) == 0) {
+ lsb++;
+ }
+ align = 1 << lsb;
+ }
+ /* always align at least to paragraph (16byte) boundary
+ * hm... since the length is always in paragraphs, we cannot
+ * align outside of paragraphs anyway... so this check might
+ * be unnecessary...*/
+ if (align < 0x10) {
+ align = 0x10;
+ }
+ DEBUG_PRINTF_PMM("%s: align: 0x%x\n", __func__,
+ align);
+ if ((next_offset & (align - 1)) != 0) {
+ /* not yet aligned... align! */
+ next_offset += align;
+ next_offset &= ~(align - 1);
+ }
+ if ((next_offset + length) > 0xFFFF) {
+ rval = 0;
+ printf
+ ("%s: pmmAllocate: Not enough memory available for allocation!\n",
+ __func__);
+ goto exit;
+ }
+ curr_pmm_allocation_index++;
+ /* remember the values in pmm_allocation_array */
+ pmm_alloc->handle = handle;
+ pmm_alloc->offset = next_offset;
+ pmm_alloc->length = length;
+ /* return the 32bit "physical" address, i.e. combination of segment and offset */
+ rval = ((u32) (PMM_CONV_SEGMENT << 16)) | next_offset;
+ DEBUG_PRINTF_PMM
+ ("%s: pmmAllocate: allocated memory at %x\n",
+ __func__, rval);
+ } else {
+ rval = 0;
+ printf
+ ("%s: pmmAllocate: allocation in extended memory not supported!\n",
+ __func__);
+ }
+ goto exit;
+ case 1:
+ /* function pmmFind */
+ handle = pop_long(); /* the handle to lookup */
+ DEBUG_PRINTF_PMM("%s: pmmFind: Handle: %x\n", __func__,
+ handle);
+ i = 0;
+ for (i = 0; i < curr_pmm_allocation_index; i++) {
+ if (pmm_allocation_array[i].handle == handle) {
+ DEBUG_PRINTF_PMM
+ ("%s: pmmFind: found allocated memory at %x\n",
+ __func__, rval);
+ /* return the 32bit "physical" address, i.e. combination of segment and offset */
+ rval =
+ ((u32) (PMM_CONV_SEGMENT << 16)) |
+ pmm_allocation_array[i].offset;
+ }
+ }
+ if (rval == 0) {
+ DEBUG_PRINTF_PMM
+ ("%s: pmmFind: handle (%x) not found!\n",
+ __func__, handle);
+ }
+ goto exit;
+ case 2:
+ /* function pmmDeallocate */
+ buffer = pop_long();
+ /* since argument is the address of the PMM block (including the segment,
+ * we need to remove the segment to get the offset
+ */
+ buffer = buffer ^ ((u32) PMM_CONV_SEGMENT << 16);
+ DEBUG_PRINTF_PMM("%s: pmmDeallocate: PMM segment offset: %x\n",
+ __func__, buffer);
+ i = 0;
+ /* rval = 0 means we deallocated the buffer, so set it to 1 in case we dont find it and
+ * thus cannot deallocate
+ */
+ rval = 1;
+ for (i = 0; i < curr_pmm_allocation_index; i++) {
+ DEBUG_PRINTF_PMM("%d: %x\n", i,
+ pmm_allocation_array[i].handle);
+ if (pmm_allocation_array[i].offset == buffer) {
+ /* we found the requested buffer, rval = 0 */
+ rval = 0;
+ DEBUG_PRINTF_PMM
+ ("%s: pmmDeallocate: found allocated memory at index: %d\n",
+ __func__, i);
+ /* copy the remaining elements in pmm_allocation_array one position up */
+ j = i;
+ for (; j < curr_pmm_allocation_index; j++) {
+ pmm_allocation_array[j] =
+ pmm_allocation_array[j + 1];
+ }
+ /* move curr_pmm_allocation_index one up, too */
+ curr_pmm_allocation_index--;
+ /* finally clean last element */
+ pmm_allocation_array[curr_pmm_allocation_index].
+ handle = 0;
+ pmm_allocation_array[curr_pmm_allocation_index].
+ offset = 0;
+ pmm_allocation_array[curr_pmm_allocation_index].
+ length = 0;
+ break;
+ }
+ }
+ if (rval != 0) {
+ DEBUG_PRINTF_PMM
+ ("%s: pmmDeallocate: offset (%x) not found, cannot deallocate!\n",
+ __func__, buffer);
+ }
+ goto exit;
+ default:
+ /* invalid/unimplemented function */
+ printf("%s: invalid PMM function (0x%04x) called!\n",
+ __func__, function);
+ /* PMM spec says if function is invalid, return 0xFFFFFFFF */
+ rval = 0xFFFFFFFF;
+ goto exit;
+ }
+ exit:
+ /* exit handler of this function, restore registers, put return value in DX:AX */
+ M.x86 = backup_regs;
+ M.x86.R_DX = (u16) ((rval >> 16) & 0xFFFF);
+ M.x86.R_AX = (u16) (rval & 0xFFFF);
+ CHECK_DBG(DEBUG_PMM) {
+ DEBUG_PRINTF_PMM("%s: dump of pmm_allocation_array:\n",
+ __func__);
+ for (i = 0; i < MAX_PMM_AREAS; i++) {
+ DEBUG_PRINTF_PMM
+ ("%d:\n\thandle: %x\n\toffset: %x\n\tlength: %x\n",
+ i, pmm_allocation_array[i].handle,
+ pmm_allocation_array[i].offset,
+ pmm_allocation_array[i].length);
+ }
+ }
+ return;
+}
+
+/* This function tests the pmm_handleInt() function above. */
+void pmm_test(void)
+{
+ u32 handle, length, addr;
+ u16 function, flags;
+ /*-------------------- Test simple allocation/find/deallocation ----------------------------- */
+ function = 0; /* pmmAllocate */
+ handle = 0xdeadbeef;
+ length = 16; /* in 16byte paragraphs, so we allocate 256 bytes... */
+ flags = 0x1; /* conventional memory, unaligned */
+ /* setup stack for call to pmm_handleInt() */
+ push_word(flags);
+ push_long(handle);
+ push_long(length);
+ push_word(function);
+ push_long(0); /* This is the return address for the ABI, unused in this implementation */
+ pmm_handleInt();
+ addr = ((u32) M.x86.R_DX << 16) | M.x86.R_AX;
+ DEBUG_PRINTF_PMM("%s: allocated memory at: %04x:%04x\n", __func__,
+ M.x86.R_DX, M.x86.R_AX);
+ function = 1; /* pmmFind */
+ push_long(handle);
+ push_word(function);
+ push_long(0); /* This is the return address for the ABI, unused in this implementation */
+ pmm_handleInt();
+ DEBUG_PRINTF_PMM("%s: found memory at: %04x:%04x (expected: %08x)\n",
+ __func__, M.x86.R_DX, M.x86.R_AX, addr);
+ function = 2; /* pmmDeallocate */
+ push_long(addr);
+ push_word(function);
+ push_long(0); /* This is the return address for the ABI, unused in this implementation */
+ pmm_handleInt();
+ DEBUG_PRINTF_PMM
+ ("%s: freed memory rval: %04x:%04x (expected: 0000:0000)\n",
+ __func__, M.x86.R_DX, M.x86.R_AX);
+ /*-------------------- Test aligned allocation/deallocation ----------------------------- */
+ function = 0; /* pmmAllocate */
+ handle = 0xdeadbeef;
+ length = 257; /* in 16byte paragraphs, so we allocate 4KB + 16 bytes... */
+ flags = 0x1; /* conventional memory, unaligned */
+ /* setup stack for call to pmm_handleInt() */
+ push_word(flags);
+ push_long(handle);
+ push_long(length);
+ push_word(function);
+ push_long(0); /* This is the return address for the ABI, unused in this implementation */
+ pmm_handleInt();
+ addr = ((u32) M.x86.R_DX << 16) | M.x86.R_AX;
+ DEBUG_PRINTF_PMM("%s: allocated memory at: %04x:%04x\n", __func__,
+ M.x86.R_DX, M.x86.R_AX);
+ function = 0; /* pmmAllocate */
+ handle = 0xf00d4b0b;
+ length = 128; /* in 16byte paragraphs, so we allocate 2KB... */
+ flags = 0x5; /* conventional memory, aligned */
+ /* setup stack for call to pmm_handleInt() */
+ push_word(flags);
+ push_long(handle);
+ push_long(length);
+ push_word(function);
+ push_long(0); /* This is the return address for the ABI, unused in this implementation */
+ pmm_handleInt();
+ /* the address should be aligned to 0x800, so probably it is at offset 0x1800... */
+ addr = ((u32) M.x86.R_DX << 16) | M.x86.R_AX;
+ DEBUG_PRINTF_PMM("%s: allocated memory at: %04x:%04x\n", __func__,
+ M.x86.R_DX, M.x86.R_AX);
+ function = 1; /* pmmFind */
+ push_long(handle);
+ push_word(function);
+ push_long(0); /* This is the return address for the ABI, unused in this implementation */
+ pmm_handleInt();
+ addr = ((u32) M.x86.R_DX << 16) | M.x86.R_AX;
+ function = 2; /* pmmDeallocate */
+ push_long(addr);
+ push_word(function);
+ push_long(0); /* This is the return address for the ABI, unused in this implementation */
+ pmm_handleInt();
+ DEBUG_PRINTF_PMM
+ ("%s: freed memory rval: %04x:%04x (expected: 0000:0000)\n",
+ __func__, M.x86.R_DX, M.x86.R_AX);
+ handle = 0xdeadbeef;
+ function = 1; /* pmmFind */
+ push_long(handle);
+ push_word(function);
+ push_long(0); /* This is the return address for the ABI, unused in this implementation */
+ pmm_handleInt();
+ addr = ((u32) M.x86.R_DX << 16) | M.x86.R_AX;
+ function = 2; /* pmmDeallocate */
+ push_long(addr);
+ push_word(function);
+ push_long(0); /* This is the return address for the ABI, unused in this implementation */
+ pmm_handleInt();
+ DEBUG_PRINTF_PMM
+ ("%s: freed memory rval: %04x:%04x (expected: 0000:0000)\n",
+ __func__, M.x86.R_DX, M.x86.R_AX);
+ /*-------------------- Test out of memory allocation ----------------------------- */
+ function = 0; /* pmmAllocate */
+ handle = 0xdeadbeef;
+ length = 0; /* length zero means, give me the largest possible block */
+ flags = 0x1; /* conventional memory, unaligned */
+ /* setup stack for call to pmm_handleInt() */
+ push_word(flags);
+ push_long(handle);
+ push_long(length);
+ push_word(function);
+ push_long(0); /* This is the return address for the ABI, unused in this implementation */
+ pmm_handleInt();
+ length = ((u32) M.x86.R_DX << 16) | M.x86.R_AX;
+ length /= 16; /* length in paragraphs */
+ DEBUG_PRINTF_PMM("%s: largest possible length: %08x\n", __func__,
+ length);
+ function = 0; /* pmmAllocate */
+ flags = 0x1; /* conventional memory, aligned */
+ /* setup stack for call to pmm_handleInt() */
+ push_word(flags);
+ push_long(handle);
+ push_long(length);
+ push_word(function);
+ push_long(0); /* This is the return address for the ABI, unused in this implementation */
+ pmm_handleInt();
+ addr = ((u32) M.x86.R_DX << 16) | M.x86.R_AX;
+ DEBUG_PRINTF_PMM("%s: allocated memory at: %04x:%04x\n", __func__,
+ M.x86.R_DX, M.x86.R_AX);
+ function = 0; /* pmmAllocate */
+ length = 1;
+ handle = 0xf00d4b0b;
+ flags = 0x1; /* conventional memory, aligned */
+ /* setup stack for call to pmm_handleInt() */
+ push_word(flags);
+ push_long(handle);
+ push_long(length);
+ push_word(function);
+ push_long(0); /* This is the return address for the ABI, unused in this implementation */
+ pmm_handleInt();
+ /* this should fail, so 0x0 should be returned */
+ addr = ((u32) M.x86.R_DX << 16) | M.x86.R_AX;
+ DEBUG_PRINTF_PMM
+ ("%s: allocated memory at: %04x:%04x expected: 0000:0000\n",
+ __func__, M.x86.R_DX, M.x86.R_AX);
+ handle = 0xdeadbeef;
+ function = 1; /* pmmFind */
+ push_long(handle);
+ push_word(function);
+ push_long(0); /* This is the return address for the ABI, unused in this implementation */
+ pmm_handleInt();
+ addr = ((u32) M.x86.R_DX << 16) | M.x86.R_AX;
+ function = 2; /* pmmDeallocate */
+ push_long(addr);
+ push_word(function);
+ push_long(0); /* This is the return address for the ABI, unused in this implementation */
+ pmm_handleInt();
+ DEBUG_PRINTF_PMM
+ ("%s: freed memory rval: %04x:%04x (expected: 0000:0000)\n",
+ __func__, M.x86.R_DX, M.x86.R_AX);
+}
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