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#

# Copyright (c) 2005 Jakub Jermar

# Copyright (c) 2008 Pavel Rimsky

# All rights reserved.

#

# Redistribution and use in source and binary forms, with or without

# modification, are permitted provided that the following conditions

# are met:

#

# - Redistributions of source code must retain the above copyright

#   notice, this list of conditions and the following disclaimer.

# - Redistributions in binary form must reproduce the above copyright

#   notice, this list of conditions and the following disclaimer in the

#   documentation and/or other materials provided with the distribution.

# - The name of the author may not be used to endorse or promote products

#   derived from this software without specific prior written permission.

#

# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,

# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#

#include <arch/arch.h>

#include <arch/stack.h>

#include <arch/sun4v/regdef.h>

#include <arch/sun4v/hypercall.h>

#include <arch/mm/sun4v/tte.h>

#include <arch/mm/sun4v/mmu.h>

#include <arch/mm/tlb.h>

.register %g2, #scratch

.register %g3, #scratch

.section K_TEXT_START, "ax"

#define BSP_FLAG		1

#define PHYSMEM_ADDR_SIZE	56

/*

 * SILO for an unknown reason loads the image to MAPPING_OFFSET + 0x4000 bytes

 * from the start of the physical memory. We pretend that the physical memory

 * starts MAPPING_OFFSET bytes further than it actually does.

 */

#define MAPPING_OFFSET		0x400000

/*

 * Flags set in the TTE data entry mapping the kernel.

 */

#ifdef CONFIG_VIRT_IDX_DCACHE

	#define TTE_FLAGS \

		(1 << TTE_V_SHIFT) \

		| (1 << TTE_EP_SHIFT) \

		| (1 << TTE_CP_SHIFT) \

		| (1 << TTE_CV_SHIFT) \

		| (1 << TTE_P_SHIFT) \

		| (1 << TTE_W_SHIFT)

#else

	#define TTE_FLAGS \

		(1 << TTE_V_SHIFT) \

		| (1 << TTE_EP_SHIFT) \

		| (1 << TTE_CP_SHIFT) \

		| (1 << TTE_P_SHIFT) \

		| (1 << TTE_W_SHIFT)

#endif

/*

 * Fills a register with a TTE Data item. The item will map the given virtual

 * address to a real address which will be computed by adding the starting

 * address of the physical memory to the virtual address.

 *

 * parameters:

 * 	addr:			virtual address to be mapped

 *	rphysmem_start:		register containing the starting address of the

 *				physical memory

 *	rtmp1:			a register to be used as temporary

 *	rtmp2:			a register to be used as temporary

 *	rd:			register where the result will be saved

 */

#define TTE_DATA(addr, rphysmem_start, rtmp1, rtmp2, rd) \

	setx TTE_FLAGS | PAGESIZE_4M, rtmp1, rd; \

	add rd, rphysmem_start, rd; \

	setx (addr), rtmp1, rtmp2; \

	add rd, rtmp2, rd;

/*

 * Here is where the kernel is passed control from the boot loader.

 * 

 * The registers are expected to be in this state:

 * - %o0 starting address of physical memory + bootstrap processor flag

 * 	bits 63...1:	physical memory starting address / 2

 *	bit 0:		non-zero on BSP processor, zero on AP processors

 * - %o1 bootinfo structure address (BSP only)

 * - %o2 bootinfo structure size (BSP only)

 *

 * Moreover, we depend on boot having established the following environment:

 * - TLBs are on

 * - identity mapping for the kernel image

 */

.global kernel_image_start

kernel_image_start:

	mov BSP_FLAG, %l0

	and %o0, %l0, %l7			! l7 <= bootstrap processor?

	andn %o0, %l0, %l6			! l6 <= start of physical memory

	or %o1, %g0, %l1

	or %o2, %g0, %l2

	! Get bits (PHYSMEM_ADDR_SIZE - 1):13 of physmem_base.

	srlx %l6, 13, %l5

	! l5 <= physmem_base[(PHYSMEM_ADDR_SIZE - 1):13]

	sllx %l5, 13 + (63 - (PHYSMEM_ADDR_SIZE - 1)), %l5

	srlx %l5, 63 - (PHYSMEM_ADDR_SIZE - 1), %l5	

	! pretend the physical memory starts further

	set MAPPING_OFFSET, %g2

	add %l5, %g2, %l5 

	/*

	 * Setup basic runtime environment.

	 */

	wrpr %g0, NWINDOWS - 2, %cansave	! set maximum saveable windows

	wrpr %g0, 0, %canrestore		! get rid of windows we will

						! never need again

	wrpr %g0, 0, %otherwin			! make sure the window state is

						! consistent

	wrpr %g0, NWINDOWS - 1, %cleanwin	! prevent needless clean_window

						! traps for kernel

	wrpr %g0, 0, %wstate			! use default spill/fill trap

	wrpr %g0, 0, %tl			! TL = 0, primary context

						! register is used

	wrpr %g0, PSTATE_PRIV_BIT, %pstate	! disable interrupts and disable

						! 32-bit address masking

	wrpr %g0, 0, %pil			! intialize %pil

	/*

	 * Switch to kernel trap table.

	 */

	sethi %hi(trap_table), %g1

	wrpr %g1, %lo(trap_table), %tba

	/*

	 * Take over the MMU.

	 */

	! map kernel in context 1

	set kernel_image_start, %o0				! virt. address

	set 1, %o1						! context

	TTE_DATA(kernel_image_start, %l5, %g2, %g3, %o2)	! TTE data

	set MMU_FLAG_DTLB | MMU_FLAG_ITLB, %o3			! MMU flags

	__HYPERCALL_HYPERFAST(MMU_MAP_ADDR)

	! switch to context 1

	set 1, %o0

	set VA_PRIMARY_CONTEXT_REG, %o1

	stxa %o0, [%o1] ASI_PRIMARY_CONTEXT_REG

	! demap all in context 0

	set 0, %o0						! reserved

	set 0, %o1						! reserved

	set 0, %o2						! context

	set MMU_FLAG_DTLB | MMU_FLAG_ITLB, %o3			! MMU flags

	__HYPERCALL_FAST(MMU_DEMAP_CTX)

	! install permanent mapping for kernel in context 0

	set kernel_image_start, %o0				! virtual address

	set 0, %o1						! context

	TTE_DATA(kernel_image_start, %l5, %g2, %g3, %o2)	! TTE data

	set MMU_FLAG_DTLB | MMU_FLAG_ITLB, %o3			! MMU flags

	__HYPERCALL_FAST(MMU_MAP_PERM_ADDR)

	! switch to context 0

	mov 0, %o0

	set VA_PRIMARY_CONTEXT_REG, %o1

	stxa %o0, [%o1] ASI_PRIMARY_CONTEXT_REG

	! demap all in context 1 (cleanup)

	set 0, %o0						! reserved

	set 0, %o1						! reserved

	set 1, %o2						! context

	set MMU_FLAG_DTLB | MMU_FLAG_ITLB, %o3			! MMU flags

	__HYPERCALL_FAST(MMU_DEMAP_CTX)

	/*

	 * Save physmem_base for use by the mm subsystem.

	 * %l6 contains starting physical address

	 */

	sethi %hi(physmem_base), %l4

	stx %l6, [%l4 + %lo(physmem_base)]

	/*

	 * So far, we have not touched the stack.

	 * It is a good idea to set the kernel stack to a known state now.

	 */

	sethi %hi(temporary_boot_stack), %sp

	or %sp, %lo(temporary_boot_stack), %sp

	sub %sp, STACK_BIAS, %sp

	or %l1, %g0, %o1

	or %l2, %g0, %o2

	sethi %hi(bootinfo), %o0

	call memcpy				! copy bootinfo

	or %o0, %lo(bootinfo), %o0

	call arch_pre_main

	nop

	call main_bsp

	nop

	/* Not reached. */

0:

	ba 0b

	nop

.section K_DATA_START, "aw", @progbits

#define INITIAL_STACK_SIZE		1024

.align STACK_ALIGNMENT

	.space INITIAL_STACK_SIZE

.align STACK_ALIGNMENT

temporary_boot_stack:

	.space STACK_WINDOW_SAVE_AREA_SIZE

.data

.align 8

.global physmem_base		! copy of the physical memory base address

physmem_base:

	.quad 0