From c5b367835cfc7a8ef53b9670a409ffcc95194344 Mon Sep 17 00:00:00 2001 From: "Steven J. Hill" Date: Thu, 26 Feb 2015 18:16:38 -0600 Subject: MIPS: Add support for XPA. Add support for extended physical addressing (XPA) so that 32-bit platforms can access equal to or greater than 40 bits of physical addresses. NOTE: 1) XPA and EVA are not the same and cannot be used simultaneously. 2) If you configure your kernel for XPA, the PTEs and all address sizes become 64-bit. 3) Your platform MUST have working HIGHMEM support. Signed-off-by: Steven J. Hill Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/9355/ Signed-off-by: Ralf Baechle --- arch/mips/kernel/cpu-probe.c | 4 ++++ arch/mips/kernel/proc.c | 1 + 2 files changed, 5 insertions(+) (limited to 'arch/mips/kernel') diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c index 48dfb9de853d..ac96817d1f99 100644 --- a/arch/mips/kernel/cpu-probe.c +++ b/arch/mips/kernel/cpu-probe.c @@ -516,6 +516,10 @@ static inline unsigned int decode_config5(struct cpuinfo_mips *c) c->options |= MIPS_CPU_MAAR; if (config5 & MIPS_CONF5_LLB) c->options |= MIPS_CPU_RW_LLB; +#ifdef CONFIG_XPA + if (config5 & MIPS_CONF5_MVH) + c->options |= MIPS_CPU_XPA; +#endif return config5 & MIPS_CONF_M; } diff --git a/arch/mips/kernel/proc.c b/arch/mips/kernel/proc.c index 130af7d26a9c..298b2b773d12 100644 --- a/arch/mips/kernel/proc.c +++ b/arch/mips/kernel/proc.c @@ -120,6 +120,7 @@ static int show_cpuinfo(struct seq_file *m, void *v) if (cpu_has_msa) seq_printf(m, "%s", " msa"); if (cpu_has_eva) seq_printf(m, "%s", " eva"); if (cpu_has_htw) seq_printf(m, "%s", " htw"); + if (cpu_has_xpa) seq_printf(m, "%s", " xpa"); seq_printf(m, "\n"); if (cpu_has_mmips) { -- cgit v1.2.2