powerpc: add usermode support

The biggest difficulty for user mode is MMU support. Otherwise it is
a simple matter of setting and clearing MSR[PR] with rfid and sc
respectively.

Some common harness

powerpc: add usermode support

The biggest difficulty for user mode is MMU support. Otherwise it is
a simple matter of setting and clearing MSR[PR] with rfid and sc
respectively.

Some common harness operations will fail in usermode, so some workarounds
are reqiured (e.g., puts() can't be used directly).

A usermode privileged instruction interrupt test is added.

Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Message-ID: <20240612052322.218726-8-npiggin@gmail.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

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powerpc: Add MMU support

Add support for radix MMU, 4kB and 64kB pages.

This also adds MMU interrupt test cases, and runs the interrupts
test entirely with MMU enabled if it is available (aside fro

powerpc: Add MMU support

Add support for radix MMU, 4kB and 64kB pages.

This also adds MMU interrupt test cases, and runs the interrupts
test entirely with MMU enabled if it is available (aside from
machine check tests).

Acked-by: Andrew Jones <andrew.jones@linux.dev> (configure changes)
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Message-ID: <20240612052322.218726-5-npiggin@gmail.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

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powerpc: add SMP and IPI support

powerpc SMP support is very primitive and does not set up a first-class
runtime environment for secondary CPUs.

This reworks SMP support, and provides a complete C

powerpc: add SMP and IPI support

powerpc SMP support is very primitive and does not set up a first-class
runtime environment for secondary CPUs.

This reworks SMP support, and provides a complete C and harness
environment for the secondaries, including interrupt handling, as well
as IPI support.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Message-ID: <20240504122841.1177683-17-npiggin@gmail.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

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powerpc: Support powernv machine with QEMU TCG

Add support for QEMU's powernv machine. This uses standard firmware
(skiboot) rather than a minimal firmware shim.

Reviewed-by: Cédric Le Goater <clg@

powerpc: Support powernv machine with QEMU TCG

Add support for QEMU's powernv machine. This uses standard firmware
(skiboot) rather than a minimal firmware shim.

Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Message-ID: <20240504122841.1177683-10-npiggin@gmail.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

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powerpc: interrupt stack backtracing

Add support for backtracing across interrupt stacks, and add
interrupt frame backtrace for unhandled interrupts.

This requires a back-chain created from initial

powerpc: interrupt stack backtracing

Add support for backtracing across interrupt stacks, and add
interrupt frame backtrace for unhandled interrupts.

This requires a back-chain created from initial interrupt stack
frame to the r1 value of the interrupted context. A label is
added at the return location of the exception handler call, so
the unwinder can recognize the initial interrupt frame.

The additional cstart entry-frame is no longer required because
the unwinder now looks for frame == 0 as well as address == 0.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Message-ID: <20240405083539.374995-11-npiggin@gmail.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

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powerpc: add asm/time.h header with delay and get_clock_us/ms

This matches s390x clock and delay APIs, so common test code can start
using time facilities.

Signed-off-by: Nicholas Piggin <npiggin@g

powerpc: add asm/time.h header with delay and get_clock_us/ms

This matches s390x clock and delay APIs, so common test code can start
using time facilities.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Message-ID: <20240226093832.1468383-5-npiggin@gmail.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

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powerpc: Make interrupt handler error more readable

Installing the same handler twice reports a shifted trap vector
address which is hard to decipher. Print the unshifted address.

Signed-off-by: Ni

powerpc: Make interrupt handler error more readable

Installing the same handler twice reports a shifted trap vector
address which is hard to decipher. Print the unshifted address.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Message-ID: <20231216134257.1743345-14-npiggin@gmail.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

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powerpc: Expand exception handler vector granularity

Exception handlers are currently indexed in units of 0x100, but
powerpc can have vectors that are aligned to as little as 0x20
bytes. Increase gr

powerpc: Expand exception handler vector granularity

Exception handlers are currently indexed in units of 0x100, but
powerpc can have vectors that are aligned to as little as 0x20
bytes. Increase granularity of the handler functions before
adding support for those vectors.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Message-ID: <20231216134257.1743345-15-npiggin@gmail.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

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powerpc: Abstract H_CEDE calls into a sleep functions

This consolidates several implementations, and it no longer leaves
MSR[EE] enabled after the decrementer interrupt is handled, but
rather disabl

powerpc: Abstract H_CEDE calls into a sleep functions

This consolidates several implementations, and it no longer leaves
MSR[EE] enabled after the decrementer interrupt is handled, but
rather disables it on return.

The handler no longer allows a continuous ticking, but rather dec
has to be re-armed and EE re-enabled (e.g., via H_CEDE hcall) each
time.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Message-Id: <20230608075826.86217-4-npiggin@gmail.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

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powerpc: Add some checking to exception handler install

Check to ensure exception handlers are not being overwritten or
invalid exception numbers are used.

Signed-off-by: Nicholas Piggin <npiggin@g

powerpc: Add some checking to exception handler install

Check to ensure exception handlers are not being overwritten or
invalid exception numbers are used.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20230608075826.86217-3-npiggin@gmail.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

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powerpc: Report instruction address and MSR in unhandled exception error

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Message-Id: <20230608075826.86217-2-npiggin@gmail.com>
Signed-off-by: Thom

powerpc: Report instruction address and MSR in unhandled exception error

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Message-Id: <20230608075826.86217-2-npiggin@gmail.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

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use %# instead of 0x% in all format strings

It's one character shorter, properly prefixed, and also provides error
detection: %#d triggers a warning.

Done with `sed -i 's/0x%/%#/g' **/*.[ch]` to mo

use %# instead of 0x% in all format strings

It's one character shorter, properly prefixed, and also provides error
detection: %#d triggers a warning.

Done with `sed -i 's/0x%/%#/g' **/*.[ch]` to motivate the use of %#,
existing padding was raised by 2 to account for the counted "0x" (output
should be the same).

Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>

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Add LGPL information to some ARM and PPC specific library files

Some files are still lacking license information, so add the default LGPL
statement here to make it clear under which conditions the c

Add LGPL information to some ARM and PPC specific library files

Some files are still lacking license information, so add the default LGPL
statement here to make it clear under which conditions the code can be used.

Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-Id: <1493812229-21037-2-git-send-email-thuth@redhat.com>
Acked-by: Andrew Jones <drjones@redhat.com>
Reviewed-by: Laurent Vivier <lvivier@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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lib/powerpc: Implement generic delay function for use in unit tests

It would be nice if we had a generic delay function which could be used
in unit tests, add one.

Add the variable tb_hz used to st

lib/powerpc: Implement generic delay function for use in unit tests

It would be nice if we had a generic delay function which could be used
in unit tests, add one.

Add the variable tb_hz used to store the time base frequency which is read
from the device tree on setup.

Add functions mdelay, udelay and delay in processor.c to delay for a given
number of milliseconds, microseconds and time base ticks respectively.

Signed-off-by: Suraj Jitindar Singh <sjitindarsingh@gmail.com>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>

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powerpc: add exception handler

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: David Gibson <dgibson@redhat.com>
Message-Id: <1458560014-28862-2-git-send-email-lvivier@redhat.com>
Si

powerpc: add exception handler

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: David Gibson <dgibson@redhat.com>
Message-Id: <1458560014-28862-2-git-send-email-lvivier@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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