arm64: early_printk: add support for FastModel console output
Enable early_printk to use the FastModel semihosting to output the early kernel messages. Works both for host and guest kernels. To use this feature, pass "early_printk=smh" to the kernel. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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@ -40,6 +40,17 @@ static void pl011_printch(char ch)
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;
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}
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/*
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* Semihosting-based debug console
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*/
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static void smh_printch(char ch)
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{
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asm volatile("mov x1, %0\n"
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"mov x0, #3\n"
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"hlt 0xf000\n"
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: : "r" (&ch) : "x0", "x1", "memory");
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}
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struct earlycon_match {
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const char *name;
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void (*printch)(char ch);
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@ -47,6 +58,7 @@ struct earlycon_match {
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static const struct earlycon_match earlycon_match[] __initconst = {
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{ .name = "pl011", .printch = pl011_printch, },
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{ .name = "smh", .printch = smh_printch, },
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{}
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};
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