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Implement assorted pSeries hcalls and RTAS methods

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This patch adds several small utility hypercalls and RTAS methods to
the pSeries platform emulation.  Specifically:

* 'display-character' rtas call

This just prints a character to the console, it's occasionally used
for early debug of the OS.  The support includes a hack to make this
RTAS call respond on the normal token value present on real hardware,
since some early debugging tools just assume this value without
checking the device tree.

* 'get-time-of-day' rtas call

This one just takes the host real time, converts to the PAPR described
format and returns it to the guest.

* 'power-off' rtas call

This one shuts down the emulated system.

* H_DABR hypercall

On pSeries, the DABR debug register is usually a hypervisor resource
and virtualized through this hypercall.  If the hypercall is not
present, Linux will under some circumstances attempt to manipulate the
DABR directly which will fail on this emulated machine.

This stub implementation is enough to stop that behaviour, although it
doesn't actually implement the requested DABR operations as yet.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: David Gibson <dwg@au1.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
David Gibson 2011-04-01 15:15:24 +11:00 • committed by Alexander Graf
parent 39ac845510
commit 821303f59b
3 changed files with 80 additions and 1 deletions
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2
hw/spapr.c
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@ -63,7 +63,7 @@ static void *spapr_create_fdt(int *fdt_size, ram_addr_t ramsize,
uint32_t start_prop = cpu_to_be32(initrd_base);
uint32_t end_prop = cpu_to_be32(initrd_base + initrd_size);
uint32_t pft_size_prop[] = {0, cpu_to_be32(hash_shift)};
char hypertas_prop[] = "hcall-pft\0hcall-term";
char hypertas_prop[] = "hcall-pft\0hcall-term\0hcall-dabr";
int i;
char *modelname;
int ret;