Re: [PATCH kvmtool 06/21] hw/i8042: Refactor trap handler
From: Alexandru Elisei <hidden>
Date: 2021-02-11 17:24:12
Also in:
kvm, kvmarm
Hi Andre, On 12/10/20 2:28 PM, Andre Przywara wrote:
quoted hunk ↗ jump to hunk
With the planned retirement of the special ioport emulation code, we need to provide an emulation function compatible with the MMIO prototype. Adjust the trap handler to use that new function, and provide shims to implement the old ioport interface, for now. Signed-off-by: Andre Przywara <andre.przywara@arm.com> --- hw/i8042.c | 68 +++++++++++++++++++++++++++--------------------------- 1 file changed, 34 insertions(+), 34 deletions(-)diff --git a/hw/i8042.c b/hw/i8042.c index 36ee183f..eb1f9d28 100644 --- a/hw/i8042.c +++ b/hw/i8042.c@@ -292,52 +292,52 @@ static void kbd_reset(void) }; } -/* - * Called when the OS has written to one of the keyboard's ports (0x60 or 0x64) - */ -static bool kbd_in(struct ioport *ioport, struct kvm_cpu *vcpu, u16 port, void *data, int size) +static void kbd_io(struct kvm_cpu *vcpu, u64 addr, u8 *data, u32 len, + u8 is_write, void *ptr) { - switch (port) { - case I8042_COMMAND_REG: { - u8 value = kbd_read_status(); - ioport__write8(data, value); + u8 value; + + if (is_write) + value = ioport__read8(data); + + switch (addr) { + case I8042_COMMAND_REG: + if (is_write) + kbd_write_command(vcpu->kvm, value); + else + value = kbd_read_status(); break; - } - case I8042_DATA_REG: { - u8 value = kbd_read_data(); - ioport__write8(data, value); + case I8042_DATA_REG: + if (is_write) + kbd_write_data(value); + else + value = kbd_read_data(); break; - } - case I8042_PORT_B_REG: { - ioport__write8(data, 0x20); + case I8042_PORT_B_REG: + if (!is_write) + value = 0x20; break; - } default: - return false; + return;
Any particular reason for removing the false return value? I don't see it mentioned in the commit message. Otherwise this is identical to the two functions it replaces.
}
+ if (!is_write)
+ ioport__write8(data, value);
+}
+
+/*
+ * Called when the OS has written to one of the keyboard's ports (0x60 or 0x64)
+ */
+static bool kbd_in(struct ioport *ioport, struct kvm_cpu *vcpu, u16 port, void *data, int size)
+{
+ kbd_io(vcpu, port, data, size, false, NULL);is_write is an u8, not a bool. I never could wrap my head around the ioport convention of "in" (read) and "out" (write). To be honest, changing is_write changed to an enum so it's crystal clear what is happening would help with that a lot, but I guess that's a separate patch. Thanks, Alex
+
return true;
}
static bool kbd_out(struct ioport *ioport, struct kvm_cpu *vcpu, u16 port, void *data, int size)
{
- switch (port) {
- case I8042_COMMAND_REG: {
- u8 value = ioport__read8(data);
- kbd_write_command(vcpu->kvm, value);
- break;
- }
- case I8042_DATA_REG: {
- u8 value = ioport__read8(data);
- kbd_write_data(value);
- break;
- }
- case I8042_PORT_B_REG: {
- break;
- }
- default:
- return false;
- }
+ kbd_io(vcpu, port, data, size, true, NULL);
return true;
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