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NOVA-microhypervisor
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Arm: Initial functionality.

This commit is contained in:
Udo Steinberg 2021-02-15 14:15:09 +01:00
parent 10cadedaea
commit 119689f123
6 changed files with 190 additions and 1 deletions
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9
Makefile
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@ -63,7 +63,11 @@ OBJ := $(patsubst %.ld,$(PAT_OBJ), $(patsubst %.S,$(PAT_OBJ), $(patsubst %.cpp,$
OBJ_DEP := $(OBJ:%.o=%.d)
DIG := $(BLD_DIR)/digest
ifeq ($(ARCH),aarch64)
HYP := $(BLD_DIR)/$(ARCH)-$(BOARD)-nova
else
HYP := $(BLD_DIR)/$(ARCH)-nova
endif
ELF := $(HYP).elf
BIN := $(HYP).bin
@ -87,7 +91,10 @@ VPATH := $(SRC_DIR)
# Optimization options
DFLAGS := -MP -MMD -pipe
OFLAGS := -Os
ifeq ($(ARCH),x86_64)
ifeq ($(ARCH),aarch64)
AFLAGS := -march=armv8-a -mcmodel=large -mgeneral-regs-only $(call check,-mno-outline-atomics) -mstrict-align
DEFINES += BOARD_$(BOARD)
else ifeq ($(ARCH),x86_64)
AFLAGS := -Wa,--divide,--noexecstack -march=x86-64-v2 -mcmodel=kernel -mgeneral-regs-only -mno-red-zone
else
$(error $(ARCH) is not a valid architecture)

22
inc/aarch64/extern.hpp Normal file
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@ -0,0 +1,22 @@
/*
* External Symbols
*
* Copyright (C) 2019-2025 Udo Steinberg, BlueRock Security, Inc.
*
* This file is part of the NOVA microhypervisor.
*
* NOVA is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* NOVA is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License version 2 for more details.
*/
#pragma once
#include "types.hpp"
extern char GIT_VER;

31
inc/aarch64/lowlevel.hpp Normal file
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@ -0,0 +1,31 @@
/*
* Low-Level Functions
*
* Copyright (C) 2019-2025 Udo Steinberg, BlueRock Security, Inc.
*
* This file is part of the NOVA microhypervisor.
*
* NOVA is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* NOVA is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License version 2 for more details.
*/
#pragma once
#include "compiler.hpp"
static inline void pause()
{
asm volatile ("yield" : : : "memory");
}
[[noreturn]] static inline void shutdown()
{
for (;;)
asm volatile ("wfi" : : : "memory");
}

41
inc/aarch64/memory.hpp Normal file
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@ -0,0 +1,41 @@
/*
* Virtual-Memory Layout
*
* Copyright (C) 2019-2025 Udo Steinberg, BlueRock Security, Inc.
*
* This file is part of the NOVA microhypervisor.
*
* NOVA is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* NOVA is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License version 2 for more details.
*/
#pragma once
#include "alignment.hpp"
#include "board.hpp"
#ifndef RAM_SIZE
#define RAM_SIZE 0x80000000 // Assume 2GiB populated
#endif
#ifndef RAM_BASE
#define LOAD_ADDR 0
#else
#define LOAD_ADDR (RAM_BASE + RAM_SIZE - 0x2000000)
#endif
#define PTE_BPL 9
#define PAGE_BITS 12
#define LEVL_BITS(L) ((L) * PTE_BPL + PAGE_BITS)
#define PAGE_SIZE(L) BITN (LEVL_BITS (L))
#define OFFS_MASK(L) (PAGE_SIZE (L) - 1)
#define LINK_ADDR LOAD_ADDR
#define MMAP_CPU_DATA 0
#define OFFSET (LINK_ADDR - LOAD_ADDR)

88
src/aarch64/start.S Normal file
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@ -0,0 +1,88 @@
/*
* Startup Code
*
* Copyright (C) 2019-2025 Udo Steinberg, BlueRock Security, Inc.
*
* This file is part of the NOVA microhypervisor.
*
* NOVA is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* NOVA is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License version 2 for more details.
*/
#include "arch.hpp"
#include "memory.hpp"
.global __init_bsp
/*
* Macros
*/
.macro DCACHE OP
mrs x3, ctr_el0
ubfm x3, x3, #16, #19
mov x2, #4
lsl x2, x2, x3
add x1, x0, x1
sub x3, x2, #1
bic x0, x0, x3
1: dc \OP, x0
add x0, x0, x2
cmp x0, x1
blo 1b
dsb sy
.endm
/*
* Initialization Code
*/
.section .init
__init_bsp:
// Determine image boundaries
adrp x22, NOVA_HPAS
adrp x23, NOVA_HPAE
mov x24, LINK_ADDR
sub x24, x24, x22
// Refuse invalid load address
and x2, x22, #ALIGNMENT_OFFS (ALIGNMENT_NOVA)
cbnz x2, .
// Clean image to PoC
mov x0, x22
sub x1, x23, x22
DCACHE cvac
1: msr daifset, #0xf
msr spsel, #0x1
// Enable I$, D$, Disable MMU
mrs x0, sctlr_el2
orr x0, x0, #SCTLR_I
orr x0, x0, #SCTLR_C
bic x0, x0, #SCTLR_M
msr sctlr_el2, x0
isb
// Zero BSS
adr x0, ZERO_HPAS
.Lbss_loop: str xzr, [x0], #__SIZEOF_POINTER__
cmp x0, x23
blo .Lbss_loop
// Invalidate stale cache lines
adr x0, ZERO_HPAS
sub x1, x23, x0
DCACHE ivac
// Switch to boot stack
adr x0, STACK
mov sp, x0
b .

0
src/x86_64/hypervisor.ld → src/hypervisor.ld
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