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/*
* Copyright (C) 2013 Jerry Hoemann <jerry.hoemann@hp.com>
*
* Application to allocate memory at EFI. Syntax of command
* mimics the EFI Boot Service "FreePages."
*
* See UEFI spec 2.3, Section 6.2.
*
Example freeing a 5 page BS_Code setment at address: 0000000020000000 (hex)
FS1:\> memmap
Type Start End #pages Attributes
BS_Code 0000000000000000-0000000000000FFF 0000000000000001 000000000000000F
Available 0000000000001000-000000000008DFFF 000000000000008D 000000000000000F
Reserved 000000000008E000-000000000008FFFF 0000000000000002 000000000000000F
Available 0000000000090000-000000000009FFFF 0000000000000010 000000000000000F
Available 0000000000100000-000000000FFFFFFF 000000000000FF00 000000000000000F
BS_Code 0000000010000000-0000000010061FFF 0000000000000062 000000000000000F
Available 0000000010062000-000000001FFFFFFF 000000000000FF9E 000000000000000F
BS_Code 0000000020000000-0000000020004FFF 0000000000000005 000000000000000F
Available 0000000020005000-000000005DDFFFFF 000000000003DDFB 000000000000000F
BS_Data 000000005DE00000-000000005DFFFFFF 0000000000000200 000000000000000F
Available 000000005E000000-000000006DE7CFFF 000000000000FE7D 000000000000000F
ACPI_NVS 000000006DE7D000-000000006EE7CFFF 0000000000001000 000000000000000F
BS_Data 000000006EE7D000-00000000709FBFFF 0000000000001B7F 000000000000000F
Available 00000000709FC000-00000000710E3FFF 00000000000006E8 000000000000000F
FS1:\> FreePages 0000000020000000 5
FreePages: __PhysAddr__ __PgCnt__
__PhysAddr__ 0... 3FFFFFFFFFFF
__PgCnt__ [0..F000000]
All numbers hex w/ no leading 0x
FreePages(20000000,5)
FS1:\> memmap
Type Start End #pages Attributes
BS_Code 0000000000000000-0000000000000FFF 0000000000000001 000000000000000F
Available 0000000000001000-000000000008DFFF 000000000000008D 000000000000000F
Reserved 000000000008E000-000000000008FFFF 0000000000000002 000000000000000F
Available 0000000000090000-000000000009FFFF 0000000000000010 000000000000000F
Available 0000000000100000-000000000FFFFFFF 000000000000FF00 000000000000000F
BS_Code 0000000010000000-0000000010061FFF 0000000000000062 000000000000000F
Available 0000000010062000-000000005DDFFFFF 000000000004DD9E 000000000000000F
BS_Data 000000005DE00000-000000005DFFFFFF 0000000000000200 000000000000000F
Available 000000005E000000-000000006DE7CFFF 000000000000FE7D 000000000000000F
ACPI_NVS 000000006DE7D000-000000006EE7CFFF 0000000000001000 000000000000000F
BS_Data 000000006EE7D000-00000000709FBFFF 0000000000001B7F 000000000000000F
Available 00000000709FC000-00000000710E3FFF 00000000000006E8 000000000000000F
*/
#include <efi.h>
#include <efilib.h>
/*
* FreePages: __PhysAddr__ __PgCnt__
*
*/
#define MAX_NUM_PAGES 0x000000000F000000
#define MAX_ADDR ((1ULL << 46) - 1)
#define MAX_ARGS 256
#define CHAR_SPACE L' '
#define DEBUG 0
INTN
argify(CHAR16 *buf, UINTN len, CHAR16 **argv)
{
UINTN i=0, j=0;
CHAR16 *p = buf;
if (buf == 0) {
argv[0] = NULL;
return 0;
}
/* len represents the number of bytes, not the number of 16 bytes chars */
len = len >> 1;
/*
* Here we use CHAR_NULL as the terminator rather than the length
* because it seems like the EFI shell return rather bogus values for it.
* Apparently, we are guaranteed to find the '\0' character in the buffer
* where the real input arguments stop, so we use it instead.
*/
for(;;) {
while (buf[i] == CHAR_SPACE && buf[i] != CHAR_NULL && i < len) i++;
if (buf[i] == CHAR_NULL || i == len) goto end;
p = buf+i;
i++;
while (buf[i] != CHAR_SPACE && buf[i] != CHAR_NULL && i < len) i++;
argv[j++] = p;
if (buf[i] == CHAR_NULL) goto end;
buf[i] = CHAR_NULL;
if (i == len) goto end;
i++;
if (j == MAX_ARGS-1) {
Print(L"too many arguments (%d) truncating\n", j);
goto end;
}
}
end:
argv[j] = NULL;
return j;
}
EFI_STATUS
efi_main (EFI_HANDLE image, EFI_SYSTEM_TABLE *systab)
{
EFI_STATUS efi_status;
EFI_GUID LoadedImageProtocol = LOADED_IMAGE_PROTOCOL;
EFI_LOADED_IMAGE *info;
CHAR16 arglist[MAX_ARGS+1] = {0};
CHAR16 *argv[MAX_ARGS];
INTN argc = 0;
INTN err = 0;
INTN PgCnt = -1;
UINTN PhysAddr = 0;
InitializeLib(image, systab);
efi_status = uefi_call_wrapper( BS->HandleProtocol, 3, image,
&LoadedImageProtocol, &info);
Print(L"FreePages: __PhysAddr__ __PgCnt__\n");
Print(L"__PhysAddr__ 0... %llx\n", MAX_ADDR);
Print(L"__PgCnt__ [0..%lx]\n", MAX_NUM_PAGES);
Print(L"All numbers hex w/ no leading 0x\n");
Print(L"\n");
#if DEBUG
Print(L"%s\n", info->LoadOptions);
#endif
#if DEBUG
Print(L"Set up arglist\n");
#endif
CopyMem(arglist, info->LoadOptions, info->LoadOptionsSize);
#if DEBUG
Print(L"arglist = <%s>\n", arglist);
#endif
#if DEBUG
Print(L"Now try argify\n");
#endif
argc = argify(arglist, info->LoadOptionsSize, argv);
#if DEBUG
Print(L"argc = %d\n", argc);
#endif
#if DEBUG
for (c = 0; c < argc; c++ ) {
Print(L"argv[%d] = <%s>\n", c, argv[c]);
}
#endif
if (argc != 3) {
Print(L"Invalid argument count\n");
return EFI_SUCCESS;
}
PhysAddr = xtoi(argv[1]);
PgCnt = xtoi(argv[2]);
if ( (PgCnt < 0) || (PgCnt > MAX_NUM_PAGES) ) {
Print(L"Inavlid PgCnt\n");
err++;
}
if ( PhysAddr > MAX_ADDR ) {
Print(L"Inavlid Address\n");
err++;
}
if ( err ) {
return EFI_SUCCESS;
}
Print(L"FreePages(%lx,%d)\n", PhysAddr, PgCnt);
efi_status = uefi_call_wrapper(BS->FreePages, 2, PhysAddr, PgCnt);
if ( EFI_ERROR(efi_status) ) {
Print(L"Free Pages Failed: %d\n", efi_status);
return efi_status;
}
return EFI_SUCCESS;
}
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