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arm/mmu: First iteration at mapping peripherals from FDT

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* This fixes booting Haiku on Raspberry Pi and qemu (-M raspi2)
* Makes several assumptions which need corrected.
  /axi is broadcom only
  size is fixed
* The final solution will be "probing" each simple-bus device
  from the fdt. A lot of fdt support code needs written though
  for "finding" compatible devices and determining the full size
  of the devices in memory.

Change-Id: Ifd5fbab7490c8456247115f5aada618909f1bb9e
This commit is contained in:
Alexander von Gluck IV 2018-08-06 08:57:12 -05:00
parent daad9a3c1c
commit c3f9610748
1 changed files with 61 additions and 19 deletions
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80
src/system/boot/arch/arm/arch_mmu.cpp
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@ -86,23 +86,13 @@ struct memblock {
};
#warning TODO: Plot pref. base from fdt!
static struct memblock LOADER_MEMORYMAP[] = {
/*
{
"devices",
DEVICE_BASE,
DEVICE_BASE + DEVICE_SIZE - 1,
ARM_MMU_L2_FLAG_B,
},
*/
{
"RAM_kernel", // 8MB space for kernel, drivers etc
KERNEL_LOAD_BASE,
KERNEL_LOAD_BASE + kMaxKernelSize - 1,
ARM_MMU_L2_FLAG_C,
},
#ifdef FB_BASE
{
"framebuffer", // 2MB framebuffer ram
@ -344,6 +334,61 @@ mmu_map_identity(addr_t start, size_t end, int flags)
}
}
static void
map_pages_loader()
{
for (uint32 i = 0; i < B_COUNT_OF(LOADER_MEMORYMAP); i++) {
TRACE(("BLOCK: %s START: %lx END %lx\n", LOADER_MEMORYMAP[i].name,
LOADER_MEMORYMAP[i].start, LOADER_MEMORYMAP[i].end));
addr_t address = LOADER_MEMORYMAP[i].start;
ASSERT((address & ~ARM_PTE_ADDRESS_MASK) == 0);
mmu_map_identity(LOADER_MEMORYMAP[i].start, LOADER_MEMORYMAP[i].end,
LOADER_MEMORYMAP[i].flags);
}
}
static status_t
map_pages_peripherals()
{
int node;
phys_addr_t regs_start;
phys_addr_t regs_end;
const char* name = "/axi";
node = fdt_path_offset(gFDT, name);
if (node < 0) {
TRACE(("Unable to locate path offset for simple-bus!"));
return B_ERROR;
}
// determine the MMIO address
regs_start = fdt_get_device_reg(gFDT, node, false);
#warning TODO: This MMU code is overly simplistic.
if (regs_start == 0) {
// TODO: FDT's like am335x have peripherals at various
// locations. We should map *each* item within simple-bus.
panic("No reg for simple-bus. See TODO");
return B_ERROR;
}
// TODO: Obvious hack is obvious
regs_end = regs_start + 0x01000000;
TRACE(("BLOCK: %s START: %lx END %lx\n", name, regs_start, regs_end));
ASSERT((regs_start & ~ARM_PTE_ADDRESS_MASK) == 0);
mmu_map_identity(regs_start, regs_end, ARM_MMU_L2_FLAG_B);
return B_OK;
}
void
init_page_directory()
{
@ -362,16 +407,13 @@ init_page_directory()
// map our page directory region (TODO should not be identity mapped)
mmu_map_identity((addr_t)sPageDirectory, sPageTableRegionEnd, ARM_MMU_L2_FLAG_C);
for (uint32 i = 0; i < B_COUNT_OF(LOADER_MEMORYMAP); i++) {
// map our well known / static pages
map_pages_loader();
TRACE(("BLOCK: %s START: %lx END %lx\n", LOADER_MEMORYMAP[i].name,
LOADER_MEMORYMAP[i].start, LOADER_MEMORYMAP[i].end));
addr_t address = LOADER_MEMORYMAP[i].start;
ASSERT((address & ~ARM_PTE_ADDRESS_MASK) == 0);
mmu_map_identity(LOADER_MEMORYMAP[i].start, LOADER_MEMORYMAP[i].end,
LOADER_MEMORYMAP[i].flags);
// map peripheral devices from fdt
if (map_pages_peripherals() != B_OK) {
// This is a panic since we still have serial access.
panic("%s: unable to map peripherals! Check FDT.\n", __func__);
}
mmu_flush_TLB();