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PPC: mac_nvram: Split NVRAM into OF and OSX parts

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Mac OS X (at least with -M mac99) searches for a valid NVRAM partition
of a special Apple type. If it can't find that partition in the first
half of NVRAM, it will look at the second half.

There are a few implications from this. The first is that we need to
split NVRAM into 2 halves - one for Open Firmware use, the other one for
Mac OS X. Without this split Mac OS X will just loop endlessly over the
second half trying to find a partition.

The other implication is that we should provide a specially crafted Mac
OS X compatible NVRAM partition on the second half that Mac OS X can
happily use as it sees fit.

Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Alexander Graf 2014-07-13 17:09:55 +02:00
parent b19eae18c1
commit 2d9907a333
1 changed files with 40 additions and 3 deletions
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43
hw/nvram/mac_nvram.c
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@ -26,6 +26,7 @@
#include "hw/nvram/openbios_firmware_abi.h"
#include "sysemu/sysemu.h"
#include "hw/ppc/mac.h"
#include <zlib.h>
/* debug NVR */
//#define DEBUG_NVR
@ -137,15 +138,16 @@ static void macio_nvram_register_types(void)
}
/* Set up a system OpenBIOS NVRAM partition */
void pmac_format_nvram_partition (MacIONVRAMState *nvr, int len)
static void pmac_format_nvram_partition_of(MacIONVRAMState *nvr, int off,
int len)
{
unsigned int i;
uint32_t start = 0, end;
uint32_t start = off, end;
struct OpenBIOS_nvpart_v1 *part_header;
// OpenBIOS nvram variables
// Variable partition
part_header = (struct OpenBIOS_nvpart_v1 *)nvr->data;
part_header = (struct OpenBIOS_nvpart_v1 *)&nvr->data[start];
part_header->signature = OPENBIOS_PART_SYSTEM;
pstrcpy(part_header->name, sizeof(part_header->name), "system");
@ -173,4 +175,39 @@ void pmac_format_nvram_partition (MacIONVRAMState *nvr, int len)
OpenBIOS_finish_partition(part_header, end - start);
}
#define OSX_NVRAM_SIGNATURE (0x5A)
/* Set up a Mac OS X NVRAM partition */
static void pmac_format_nvram_partition_osx(MacIONVRAMState *nvr, int off,
int len)
{
uint32_t start = off;
struct OpenBIOS_nvpart_v1 *part_header;
unsigned char *data = &nvr->data[start];
/* empty partition */
part_header = (struct OpenBIOS_nvpart_v1 *)data;
part_header->signature = OSX_NVRAM_SIGNATURE;
pstrcpy(part_header->name, sizeof(part_header->name), "wwwwwwwwwwww");
OpenBIOS_finish_partition(part_header, len);
/* Generation */
stl_be_p(&data[20], 2);
/* Adler32 checksum */
stl_be_p(&data[16], adler32(0, &data[20], len - 20));
}
/* Set up NVRAM with OF and OSX partitions */
void pmac_format_nvram_partition(MacIONVRAMState *nvr, int len)
{
/*
* Mac OS X expects side "B" of the flash at the second half of NVRAM,
* so we use half of the chip for OF and the other half for a free OSX
* partition.
*/
pmac_format_nvram_partition_of(nvr, 0, len / 2);
pmac_format_nvram_partition_osx(nvr, len / 2, len / 2);
}
type_init(macio_nvram_register_types)