| #ifndef _ASM_ARC_MEM_H |
| #define _ASM_ARC_MEM_H |
| |
| /* Kernels Virtual memory area. |
| * Unlike other architectures(MIPS, sh, cris ) ARC 700 does not have a |
| * "kernel translated" region (like KSEG2 in MIPS). So we use a upper part |
| * of the translated bottom 2GB for kernel virtual memory and protect |
| * these pages from user accesses by disabling Ru, Eu and Wu. |
| */ |
| |
| /* Kernel Virtual memory Layout |
| * |
| * 0x00000000------------------->|---------------| |
| * | user space | |
| * | | |
| * | | |
| * TASK_SIZE-------------------->|---------------| |
| * | | USER_KERNEL_GUTTER(0x01000000, just as ARC_SOME_PADDING in |
| * | 16M | 2.6.30, some padding between user space and kernel virtual |
| * | | address space, ARC guys also don't know why need it) |
| * VMALLOC_START---------------->|---------------| |
| * | | |
| * | 128M/48M | VMALLOC_SIZE |
| * | 256M/64M | VMALLOC_SIZE |
| * | | |
| * PCI_REMAP_START(0x58000000)-->|---------------| |
| * | | |
| * | 512M | PCI_REMAP_SIZE(0x20000000) |
| * | | |
| * DMA_NOCACHE_START(0x78000000)>|---------------| |
| * | | |
| * | 128M | DMA_NOCACHE_SIZE(0x08000000) |
| * DMA_NOCACHE_END-----| | | |
| * PAGE_OFFSET(0x80000000)------>|---------------| |
| * | | |
| * | kernel 2G | |
| * | | |
| * (0xffffffff)------>|---------------| |
| */ |
| |
| #define DMA_NOCACHE_SIZE (RUBY_MAX_DRAM_SIZE) /*must be >= memory size, not very scalable with DDR size growing*/ |
| #define DMA_NOCACHE_START (PAGE_OFFSET - DMA_NOCACHE_SIZE) |
| #define DMA_NOCACHE_END (PAGE_OFFSET) |
| |
| /* PCI remapping */ |
| #define PCI_REMAP_SIZE (128*1024*1024) |
| #define PCI_REMAP_START (DMA_NOCACHE_START - PCI_REMAP_SIZE) |
| #define PCI_REMAP_END (DMA_NOCACHE_START) |
| |
| #endif /* _ARM_ARC_MEM_H */ |
| |
