From 93bf62580a68533dc8252b9a2a055c02f34ecb67 Mon Sep 17 00:00:00 2001 From: Christian Cunningham Date: Thu, 24 Mar 2022 09:38:08 -0700 Subject: Modularized --- src/lib/mmu.c | 33 --------------------------------- 1 file changed, 33 deletions(-) delete mode 100644 src/lib/mmu.c (limited to 'src/lib/mmu.c') diff --git a/src/lib/mmu.c b/src/lib/mmu.c deleted file mode 100644 index e9dda7a..0000000 --- a/src/lib/mmu.c +++ /dev/null @@ -1,33 +0,0 @@ -#include - -#define CACHABLE 0x08 -#define BUFFERABLE 0x04 -#define NO_PERMISSIONS_REQUIRED 0b11 << 10 -#define MMU_TABLE_BASE 0x00004000 - -void mmu_start(unsigned long base, unsigned long flags); - -void mmu_section(unsigned long virtual, unsigned long physical, unsigned long flags) -{ - unsigned long offset = virtual >> 20; - unsigned long* entry = (unsigned long*)(MMU_TABLE_BASE | (offset << 2)); - unsigned long physval = (physical & 0xFFF00000) | (flags & 0x7FFC) | 0x00C02; - *entry = physval; -} - -extern unsigned long __bss_end; -void mmu_init(void) -{ - for (unsigned long addr = 0x00000000;; addr += 0x00100000) { - if (addr < (unsigned long)&__bss_end + 0x00100000) { - mmu_section(addr, addr, CACHABLE | BUFFERABLE); - } else { - mmu_section(addr, addr, NO_PERMISSIONS_REQUIRED); - } - if (addr == 0x02000000) - mmu_section(addr, addr, CACHABLE | BUFFERABLE | NO_PERMISSIONS_REQUIRED); - if (addr == 0xFFF00000) - break; - } - mmu_start(MMU_TABLE_BASE,0x00000001|0x1000|0x0004); -} -- cgit v1.2.1