1 // SPDX-License-Identifier: GPL-2.0-or-later
5 #include <linux/fcntl.h>
8 #include <asm/bootinfo.h>
11 #include <boot_param.h>
15 #ifndef CONFIG_LEFI_FIRMWARE_INTERFACE
17 u32 memsize, highmemsize;
19 void __init prom_init_memory(void)
21 add_memory_region(0x0, (memsize << 20), BOOT_MEM_RAM);
23 add_memory_region(memsize << 20, LOONGSON_PCI_MEM_START - (memsize <<
24 20), BOOT_MEM_RESERVED);
26 #ifdef CONFIG_CPU_SUPPORTS_ADDRWINCFG
30 bit = fls(memsize + highmemsize);
31 if (bit != ffs(memsize + highmemsize))
36 /* set cpu window3 to map CPU to DDR: 2G -> 2G */
37 LOONGSON_ADDRWIN_CPUTODDR(ADDRWIN_WIN3, 0x80000000ul,
38 0x80000000ul, (1 << bit));
41 #endif /* !CONFIG_CPU_SUPPORTS_ADDRWINCFG */
45 add_memory_region(LOONGSON_HIGHMEM_START,
46 highmemsize << 20, BOOT_MEM_RAM);
48 add_memory_region(LOONGSON_PCI_MEM_END + 1, LOONGSON_HIGHMEM_START -
49 LOONGSON_PCI_MEM_END - 1, BOOT_MEM_RESERVED);
51 #endif /* !CONFIG_64BIT */
54 #else /* CONFIG_LEFI_FIRMWARE_INTERFACE */
56 void __init prom_init_memory(void)
62 /* parse memory information */
63 for (i = 0; i < loongson_memmap->nr_map; i++) {
64 node_id = loongson_memmap->map[i].node_id;
65 mem_type = loongson_memmap->map[i].mem_type;
70 add_memory_region(loongson_memmap->map[i].mem_start,
71 (u64)loongson_memmap->map[i].mem_size << 20,
75 add_memory_region(loongson_memmap->map[i].mem_start,
76 (u64)loongson_memmap->map[i].mem_size << 20,
79 case SYSTEM_RAM_RESERVED:
80 add_memory_region(loongson_memmap->map[i].mem_start,
81 (u64)loongson_memmap->map[i].mem_size << 20,
89 #endif /* CONFIG_LEFI_FIRMWARE_INTERFACE */
91 /* override of arch/mips/mm/cache.c: __uncached_access */
92 int __uncached_access(struct file *file, unsigned long addr)
94 if (file->f_flags & O_DSYNC)
97 return addr >= __pa(high_memory) ||
98 ((addr >= LOONGSON_MMIO_MEM_START) &&
99 (addr < LOONGSON_MMIO_MEM_END));
102 #ifdef CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED
104 #include <linux/pci.h>
105 #include <linux/sched.h>
106 #include <asm/current.h>
108 static unsigned long uca_start, uca_end;
110 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
111 unsigned long size, pgprot_t vma_prot)
113 unsigned long offset = pfn << PAGE_SHIFT;
114 unsigned long end = offset + size;
116 if (__uncached_access(file, offset)) {
117 if (uca_start && (offset >= uca_start) &&
119 return __pgprot((pgprot_val(vma_prot) &
121 _CACHE_UNCACHED_ACCELERATED);
123 return pgprot_noncached(vma_prot);
128 static int __init find_vga_mem_init(void)
130 struct pci_dev *dev = 0;
137 for_each_pci_dev(dev) {
138 if ((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY) {
139 for (idx = 0; idx < PCI_NUM_RESOURCES; idx++) {
140 r = &dev->resource[idx];
141 if (!r->start && r->end)
143 if (r->flags & IORESOURCE_IO)
145 if (r->flags & IORESOURCE_MEM) {
146 uca_start = r->start;
157 late_initcall(find_vga_mem_init);
158 #endif /* !CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED */